Answers to your questions from our Paint Experts, p16

Q. How often should an iron roof be repainted? Also the outside walls which are a thin composite material?

A. In New Zealand the average repaint time for roofs is 8-10 years. Repainting should only be necessary to maintain aesthetics. Colour, roof pitch elevation and gloss of the roof paint can also alter these times. The same would apply to wall claddings. The north and western elevations always show signs of weathering sooner than the other two elevations.

Q. I have just built a workshop bench using 18mm MDF as the bench top. I am looking for hard wearing paint that will seal and have a hard durable finish that will take knocks and hammering.

A. MDF is a relatively soft material and even when painted there is a limit to what a paint system can contribute to abrasion resistance and impact damage Our best system would be to apply two coats of Resene Quick Dry waterborne primer undercoat and allow the last coat to cure for 48 hours then apply three coats of Resene Uracryl 403.

Q. Our painter has left drips and splashes of waterborne enamel paint on some of the bricks of our 1960s brick and tile unit. How can we remove these?

A. Suggest you try removal using Resene Graffiti Cleaner. Wet out the areas and leave for a few minutes then scrub using a stiff nylon brush and then rinse off.

Usually glazed old bricks are very porous and that can make complete removal a real challenge. If there are signs that it has worked you may have to repeat.

Q. I need advice on what to use for a vinyl covered board on a fish tank stand. Would I need a primer of sorts to use regular paint?

A. We suggest a coat of Resene Vinyl Wallpaper Sealer be applied before overcoating with standard waterborne paint finishes.

Q. I'm in doubt which primer/sealer to use. I removed wallpaper from my old 1970 plasterboard walls and then applied skim coat (1-2 mm of plaster) and am now choosing between Resene Sureseal or Resene Broadwall Prep and Seal. Which one would you recommend?

A. We recommend Resene Sureseal. Please refer to the back page of the Resene Sureseal data sheet.

Q. Is it normal to be leaving brushstrokes in Resene Lumbersider? I'm using a good brush and not painting in the heat of the day.

A. Resene Lumbersider is a relatively thick paint. This has been maintained over the years in formulation upgrades as this feature is seen as a positive in the market place. But yes, there is a degree of brush marking, however not usually seen when viewed from a distance. If you want to avoid this add 5% Resene Hot Weather Additive or water and see if this improves the brush marking.

Q. I bought a house with aluminium ranch sliders painted with a waterborne gloss exterior paint. The paint is chipping and peeling. Do you have a product for me to strip it off?

A. You could use a 3M Rust and Paint Removal Disc (this is attached to an electric drill). This may be quicker and easier to use then liquid paint strippers. You just need to be careful not to unduly damage the base metal.

Q. I have several one piece panel doors to repaint that have been previously spray painted in a relatively new home. They are a colour similar to Resene Double Tea or Resene Napa and are to be repainted white. They have had two coats of Resene Lustacryl white so far brushed on but the original colour is still showing through as are the paint lines where the joins would be. Will another coat solve this or do I need a coat of primer or something else?

A. It is relatively easy to over extend Resene Lustacryl and this is possibly why you are not achieving coverage as easily as you may have expected. If the product is being applied beyond the recommended application rate then this will lead to a reduced dry film thickness and coverage per coat. We recommend you apply another coat as you appear to be very close to blocking out the original colour.

Q. Which is whiter: Resene Enamacryl or Resene Super Gloss?

A. Resene Enamacryl is whiter than Resene Super Gloss but the latter will provide higher build and thus could look whiter depending on the colour of the substrate. Unfortunately, substrate effects are regularly overlooked. Oil-based enamels can yellow over time as they age, so a waterborne paint will tend to stay looking whiter.

Q. I have applied two coats of Resene Waterborne Smooth Surface Sealer onto the front panel of our night store heater in preparation for painting it with Resene Zylone Sheen wall paint. For the first coat I used a roller and got lots of air bubbles and it didn't look like it was fully covered. So this morning I lightly sanded the bubbles off and brushed on another coat. It still doesn't look like I have a good coverage as I can still see the colour of the panel. Is this to be expected?

A. Resene Waterborne Smooth Surface Sealer is an adhesion primer and for adhesion is best applied as a thin uniform coat. It is not designed to give opacity or build. I would not use Resene Zylone Sheen to paint a night store heater that will get hot in the painted areas, better to use Resene SpaceCote Low Sheen.

Q. I am painting interior windows with Resene Lusta Glo enamel for the final coat. What would be the best undercoat? The windows have previously been painted with a waterbased acrylic. Is your pigmented sealer the best option?

A. We recommend Resene Quick Dry Primer Undercoat.

Q. I've had wooden floorboards professionally sanded and polyurethaned in my bathroom reno. Unfortunately they look really bad due to some nasty dark stains that didn't come out, and because the timber is pine, and was never going to look great, irrespective of what my builder said! The polyurethane was solvent based, one pot clear. It has also made some boards turn pinkish. Two questions:
• Is there a dark tinted polyurethane product available that I could add another coat to disguise the problems while retaining the wood look?
• I understand I could use Resene Waterborne Smooth Surface Sealer on the polyurethane and then paint the floorboards. Is this correct? If so, which paint would be most hard wearing?

A. Unfortunately there isn't a dark polyurethane that would cover the problems and still retain the wood look. If you can still see the wood look you would still see the problems.

Apply an adhesion coat of Resene Waterborne Smooth Surface Sealer and leave to cure for 48 hours before overcoating (avoid water or condensation contact in the first 24 hours). Apply a coat of Resene Enamel Undercoat and finish with two coats of Resene Lusta-Glo.

Q. I accidentally spot painted solventbased sealer/undercoat on a small section of a room where it previously had Resene Lumbersider. My topcoat is Resene SpaceCote Low Sheen waterborne. Will this cause a problem?

A. Lightly sand the area of the solventborne paint with 220 grit sandpaper, dust off then proceed with application of the Resene SpaceCote Low Sheen.

Q. We have used Resene Zylone Sheen low sheen waterborne paint throughout our new house and are delighted with the finish. We do have a minor issue however in that it seems to mark really easily, for instance when putting up art work, leaving scuff marks. What is the best way of cleaning the walls to remove such scuff marks without damaging the paint work?

A. When fully cured under the right conditions Resene Zylone Sheen has good scuff resistance. If the paint was applied under certain conditions there can be migration to the surface of surfactants which may well be the reason why you are seeing marking. Suggest you clean a whole wall down using Resene Interior Paintwork Cleaner (follow the instructions in the Resene Caring for your paint finish brochure). Rinse the cloth often and change the water if the water becomes cloudy.

Q. I have painted a mural with Resene testpots and used some black permanent marker pen then overcoated in Resene anti-graffiti paint but it has smudged the marker.

A. Resene anti-graffiti clears are used over Resene testpots to give a surface that can be cleaned to remove tagging. Marker pens can be both water and solvent soluble so application of our water or solventborne two pack clears may well cause the marker pen ink to run.

Q. Does Resene have products to rejuvenate unpainted and weathered wood shingles and/or to seal shingles?

A. We have no system to restore the original shingle colour. The only option is to treat with Resene Moss & Mould Killer following label instructions then apply two coats of a Resene Woodsman exterior stain colour.

Q. I have just finished painting one of our rental properties using three different paints. Each day after cleaning up I always had paint splattered on my skin. Two required considerable scrubbing to remove but the other always washed off with a gentle warm water scrub. Does this mean it has less adhesion properties?

A. Certainly not, be assured that your observations have no relevance to dry film adhesion. Full adhesion is not achieved until a minimum of five days after application and assumes that the film has cured to achieve the correct film properties.

Q. I have a client who has a repaint on a very old villa but the weatherboards are in good condition. She wants to go with Resene Pearl Lusta but her painter has made her re-think her choice because he said it will look more yellow over time. So just wondering if you have heard of this before? I would imagine that over time with the elements on it that it would fade rather than enhance?

A. Have not seen this colour drift with the Resene tinted colour so not sure where the comment originated from. If the colour was tinted in a solventborne enamel then the alkyd resin does darken over and this is what they may be referring to but this cannot occur with a waterborne paint.

Q. We need to paint our paddock fence posts to enable them to be visible to our horses. Can you please recommend a product?

A. Resene Lumbersider would be the paint. It is an Environmental Choice approved paint.

Q. I want to paint my kitchen table. I'm going to sand the top and want to leave it as wood, but from the top down I want to paint white. What paint will work over stained wood? Do I sand first and prime then paint or can I paint straight over with an oil based paint?

A. Assuming it was a stain that was then overcoated with a clear varnish then the following can be used to give a solid paint finish: Using Resene Interior Paintwork Cleaner ensure the surfaces to be painted are clean and free from grease; pay particular attention to hand contact areas. Apply a thin coat of Resene Waterborne Smooth Surface Sealer and allow to cure without water contact for at least 48 hours before overcoating. Then apply two coats of Resene SpaceCote Low Sheen. Roll all coats using the recommended roller sleeve. The new paint system will take five days to develop good initial adhesion and continue to cure for an additional three weeks until full cure occurs. In the early stages the paint surface will not have good resistance to cleaners or abrasion as these features develop as the film undergoes curing.

Q. I have just read an old post in regards to painting ceramic floor tiles (first the Resene Waterborne Smooth Surface Sealer, then Resene Quick Dry undercoat and then two coats of Resene Lustacryl). Would you then suggest a coat or two of your waterbased polyurethane? And is it the same process for terracotta tiles? Both the ceramic tiles and terracotta tiles are in high foot traffic areas - the entrance and kitchen. I know it is less than ideal to paint, but reflooring is not in our budget for some time yet!

A. Apply a seal coat of Resene Sureseal then two coats of Resene Lustacryl.

Q. I am repainting my roof with Resene Ironsand CoolColour™. It is currently painted with a Resene white which is still in good order. Do I need to prime/undercoat the roof again prior to painting the Resene Ironsand? It seems unnecessary to me but am getting conflicting opinions.

A. If the existing coating is a waterborne roof paint and sound then all that should be needed is a scrub down with Resene Roof & Metal Wash following label directions before applying your paint.

Q. I have a renovated house that has both new (primed only) and existing painted timber weatherboards on it. The existing paint is from approx. 1970s on to Rimu and is flaking in places. What is the recommended Resene primer for both the old and newer weatherboards? Can the primer be airless spray applied? Also is there a recommended Resene exterior topcoat for timber weatherboards?

A. My preferred primer for bare rimu and pine is Resene Wood Primer. If the new weatherboards came preprimed then they will need to be sanded and then reprimed with Resene Wood Primer. The primer is air drying (needs oxygen to cure) so airless spray application would not be the best application method as this has the potential to give very high wet film thicknesses which may result in runs/sags.

Q. I want to paint my internal doors, trims and windows, internal and external, in semi-gloss white. Can I use the same paint for all of it? Or should I buy different paint for external and internal windows?

A. You can use Resene Lustacryl for both exterior and interior painting.

Q. Do you have a product that I can use to paint over Butynol to help protect against U.V. damage?

A. Yes, prime with a coat of Resene Membrane Roofing Primer then apply two coats of Resene Lumbersider.

Q. Approx. how much roof paint will I need for a house that is 120 square metres please? The roof is corrugated iron.

A. We usually add 40% to the floor area as an estimate of the roof area as this takes into account pitch and overhang. So this gives an estimated roof area of 168 sq. metres. Application of 2 coats each at 10 square metres per litre gives a total volume of 2 coats of approx. 34 litres. This is the best estimate we can give but it may well be under or over.

Q. What would you recommend as the best method to deal with corrosion on exposed metal surfaces in an area prone to salt air, high humidity etc (coastal environment)?

A. This is a classic example of sheltered corrosion due to lack of rain washing. To follow are prep steps prior to painting. If any areas of moss or mould infestation exist then treat them with Resene Moss & Mould Killer, diluted at the rate of 200ml to 1 litre of clean water. Leave for up to 48 hours to achieve full kill. For heavy infestations more applications may be needed. Scrub down using Resene Paint Prep and Housewash and rinse clean with fresh water. Apply a liberal wash of this mixture to the surface with a nylon bristle brush or broom. Thoroughly scrub the surface to ensure complete removal of all grease, moss and mould residue, and any other contaminants. Rinse clean or hose down with fresh water ensuring all salts are also removed. Remove all areas of white corrosion material and as much red rust as is practicable using mechanical methods such as a 3M Rust and Paint Removal Disc. Note: The performance of the subsequent paint systems will be largely dependent on the thoroughness of this surface preparation stage. Then apply two coats of Resene GP Metal Primer to the prepared substrate and topcoat with a Resene exterior acrylic paint finish. An annual wash-down of all coated areas with fresh water is recommended to remove accumulated salts.

Q. My window sills through the whole house have been painted in Resene Lustacryl. I would now like to get the bedrooms and hallway painted. Should walls and skirting be painted with Resene SpaceCote Low Sheen, and door frames and new wardrobes (customboard) with Resene Lustacryl (although this is glossy so not ideal look-wise for wardrobe)? Or can I paint everything with Resene Zylone Low Sheen?

A. Yes to Resene Lustacryl for skirtings and doors and we recommend Resene SpaceCote Low Sheen for walls. For bare substrate prime with Resene Quick Dry waterborne primer undercoat.

Q. Can I use spray on enamel paint on my cedar fence?

A. You can use full gloss only applied over an oil based primer. However it is rare for fences to be painted in enamel paints now as enamel paints are inflexible and do chalk relatively quickly compared to waterborne paints.

Q. We recently bought an older bungalow. It had a mould issue along the top of walls and ceilings where they met due to being left empty for some time. My painter cleaned and painted over the mould but I don't know what he undercoated it with because now I get wet patches where he treated, mainly in the mornings, they dry out again during the day. The roof is completely dry. Is there a chemical reaction happening here with his undercoat or can you advise?

A. Cannot see any reason to suspect any chemical reaction is occurring. The appearance of wet areas can only be due to water, due to leaking or condensation.

Q. We are about to build in Alexandra. The cladding will be Shadowclad®. The window frames are Ironsand. We want to use Resene Waterborne Woodsman Tiri on the Shadowclad®. Would you recommend this for the Central Otago climate?

A. If you want to stain then Resene Waterborne Woodsman would be our recommendation; if using a dark colour then use the CoolColour™ version of the stain (does not make the surface cool to touch but does reflect more heat than the same colour made using non cool technology). Cannot predict maintenance time but for north and west elevations we expect a maintenance coat will be required on average every third summer.

Q. Can I get my tin of Resene Lusta-Glo made for exterior is well?

A. Sorry but no, for an exterior semi-gloss finish we recommend Resene Lustacryl which is suitable for exterior exposure.

Q. I am trying to do a commercial kitchen renovation (very light traffic). I have an area that has concrete and one that has some very ugly coloured tiles.

A. As long as the concrete is sound and clean then Resene Aquapoxy for Flooring should be suitable. Adhesion to the tiles may be an issue depending how they are finished.

Q. I am using Resene Aquapoxy for my garage floor. What is the recommended time frame before I can drive a vehicle into the garage?

A. Usually 5-7 days.

Q. I'm painting the inside of my house and have bought the paint but I need to do the doors and they have all been painted in enamel. I hate painting with enamel. Do you have an acrylic paint which will do the job please (fingers crossed)?

A. I suspect the issue you had related to prep and not the paint. You will need to remove the failed topcoats and sand the old enamel then apply a coat of Resene Quick Dry primer undercoat and finish with two coats of a Resene waterborne enamel. For the best finish roll the waterborne enamel topcoats.

Q. Can we use Resene Write-On Wall Paint as a backsplash over a painted wall behind an induction cooktop? Can any colour and/or brand of whiteboard markers be used and easily cleaned off?

A. Yes it can be. Pental MaxiFlo is our preferred brand of whiteboard marker.

Q. We are looking at painting our boundary fences a deep charcoal or dark stain. One side of the fence is on our boundary, the other is on the neighbour's. Can you recommend what type of paint and application technique we should use? The fence is rough sawn vertical boards with trellis along the top edge. We want to avoid paint or stain leaking through to the neighbour's side as they have a lightly painted fence. It's an old fence, approx. 15 years, never been treated but reasonable condition.

A. Scrub down using Resene Timber and Deck Wash following label directions. If mould or algae is present then treat these areas with Resene Moss & Mould Killer diluted and used to label directions. Then apply a prime coat of Resene Wood Primer and finish with two coats of Resene Lumbersider. We sell a fence roller kit which is a small roller and sleeve which will cover a fence pale width.

Q. We have just finished our new house and have started with the interior painting. We were sold Resene Lumbersider for the interior paint for the bedrooms, hallway and lounge. Is this correct as we have bought the paint but now double checking your site it recommends Resene SpaceCote for interior walls?

A. Before we introduced Zylone Sheen and SpaceCote Low Sheen, Resene Lumbersider was our low sheen waterborne paint for both interior and exterior application. Can still be used for painting interior walls in any room with the exception of bathrooms, laundries and poorly ventilated rooms such as may exist with a kitchen.

Q. I want to change the colour of our internal window/door trim. The trim has previously been painted with oil based enamel and is in good condition. Can I lightly sand and then paint straight over with water based acrylic paint?

A. Degrease and sand to provide a mechanical key for the new paint system. Apply a coat of Resene Quick Dry waterborne primer undercoat and finish with two coats of a Resene waterborne enamel such as Resene SpaceCote Low Sheen or Resene Lustacryl.

Q. My covered deck has been painted but I'm not happy with the colour. Can this be painted over with a different colour?

A. You can re-apply the same paint if you want to as long as the painted surface is clean and sound.

Q. Is there a paint system that can be applied over powdercoated metal (an external meter box)?

A. The following can be used: using Resene Interior Paintwork Cleaner ensure the surfaces to be painted are clean and free from grease, paying particular attention to hand contact areas. Apply a thin coat of Resene Waterborne Smooth Surface Sealer and allow to cure without water contact for at least 48 hours before overcoating. Then apply two coats of Resene SpaceCote Low Sheen or Resene Lustacryl.

The new paint system will take 5 days to develop good initial adhesion and continue to cure for an additional three weeks until full cure occurs. In the early stages the paint surface will not have good resistance to cleaners or abrasion as these features develop as the film undergoes curing.

Q. What should I use to paint a freshly galvanised trailer?

A. Degrease using Resene Roof and Metal Wash diluted and used to label directions. Apply two coats of Resene Armourcote 221 and finish with two coats of Resene Uracryl 403.

Q. We are putting a new bathroom into an existing room. The floor is matai and I would like to paint the floor black. What is the best product to use? And will we need to seal it after the paint?

A. Apply a primer coat of Resene Quick Dry primer undercoat then two coats of any Resene Uracryl 400 Series paint.

Q. Our architect is checking with Carter Holt re Shadowclad® and paint. He did ask if the LRV would be affected by the CoolColour i.e. make it higher or does it work by just reducing infra-red rays reducing substrate stress with the LRV staying the same?

A. LRV (light reflectance value) is the way the colour looks. CoolColour™ affects the TSR (total solar reflectance). For some substrates you can choose a colour with a lower LRV if the TSR of the CoolColour is equivalent to the LRV of a colour that would meet the LRV standard.

Q. What is the best undercoat for an aged (90 year old) totara door sill?

A. Resene Quick Dry Waterborne primer undercoat is the only primer we recommend for totara.

Q. Do you recommend painting fibroplank boards black? Someone has told me that black does not last more than three years on fibroplank. Is there a special type of paint I could use? It is aged painted fibre cement which has faded and gone chalky on the north side of the house.

A. As long as the chalk residues are removed and the underlying paint is sound then you could apply a primer coat of Resene Quick Dry primer undercoat and finish with two coats of Resene Sonyx 101 CoolColour Black. The CoolColour™ black will not render the surface cool to touch but will reflect more heat than the same colour made using non cool pigmentation. Adhesion of the existing paint is the key to long term adhesion.

Q. Could you please recommend a water based paint suitable to be applied to treated pine stairs that have been coated in bitumen paint? The finish coat needs to be trafficable and also be applied to concrete.

A. Clean down using Resene Paint Prep and Housewash following label directions then apply a coat of Resene Membrane Roofing Primer to the bitumen. Seal concrete with Resene Sureseal and then apply two coats of Resene Walk-on.

Q. I want to paint a baby cot that is already painted. Can I use enamel paint? I was told that if I use zero VOC paint it wouldn't stick to the old paint.

A. Sand the existing paint work then apply a coat of Resene Quick Dry waterborne primer undercoat and finish with two coats of Resene Lustacryl waterborne enamel (both are Environmental Choice approved paints). Leave to cure for at least two weeks in a well ventilated area then wipe down with warm water and detergent before using the cot.

Q. I have purchased my first home and it has a 60s patterned tile shower and brown tile counter top in the bathroom. I don't have enough money to re-tile at this point so am wondering if it is possible to paint over ceramic tiles (both vertical and horizontal). Some of these tiles are in the shower area so will get wet frequently. The countertop won't be subject to as much water. What products would I use and how would I go about it (DIY)? How can I make the paint last as long as possible without being damaged by either water or scratches?

A. The following can be used for all areas with the exception of tiles areas within a shower box.

Using Resene Interior Paintwork Cleaner ensure the surfaces to be painted are clean and free from grease, paying particular attention to hand contact areas. Apply a thin coat of Resene Waterborne Smooth Surface Sealer and allow to cure without water contact for at least 48 hours before overcoating. Then apply two coats of Resene SpaceCote Low Sheen. Roll all coats using the recommended roller sleeve. The new paint system will take five days to develop good initial adhesion and continue to cure for an additional three weeks until full cure occurs. In the early stages the paint surface will not have good resistance to cleaners or abrasion as these features develop as the film undergoes curing. Note that painting will not reproduce the original features of the tiles.

Q. How do I paint Melteca® cupboards in the kitchen? They are currently white.

A. Using Resene Interior Paintwork Cleaner ensure the surfaces to be painted are clean and free from grease, paying particular attention to hand contact areas. Apply a thin coat of Resene Waterborne Smooth Surface Sealer and allow to cure without water contact for at least 48 hours before overcoating. Then apply two coats of Resene SpaceCote Low Sheen. Roll all coats using the recommended roller sleeve. The new paint system will take five days to develop good initial adhesion and continue to cure for an additional three weeks until full cure occurs. In the early stages the paint surface will not have good resistance to cleaners or abrasion as these features develop as the film undergoes curing. Note that painting will not reproduce the original features of the laminate.

Q. I have internal second hand wooden stairs that I don't want to use lacquer or other clear finishes on as the timber isn't of consistent type. Can I use an exterior deck paint or something else? The stairs are old bare timber stairs from a warehouse. The timber is mostly pine.

A. You could use Resene Waterborne Decking Stain or stain with Resene Colorwood and then apply coats of clear varnish for a stained outcome. For safety reasons we would also suggest a slip resistant bull nose strip be installed.

Q. Regarding paint specification to bridge structural steel: What are the long life effects of specifying a black colour over a lighter alternative?

A. The only real issue is that expansion/contraction of the steel will be greater for a black finish as black will not reflect the same level of near infra-red as a pale colour.

Q. I have used oil based sealer on a concrete garage floor and unwisely mixed some turps in. Now the dry surface still emits odour and doesn't feel safe in the garage. Am I best to leave it or coat it with some product?

A. You can use mineral turps as a thinner for Resene Sureseal. However this will generate a more noticeable odour than thinning with Resene Thinner No.2, the lower odour thinner. With good ventilation the odour should dissipate within 5-7 days. Overcoating will not lock in odour from the thinner.

Q. I have an old kauri vanity unit that I want to redo with waterproof varnish. It would be great to have a gloss finish.

A. Sand back to achieve a smooth timber substrate then apply four coats of Resene Polythane.

Q. I've stained with oil on macrocarpa beams and don't like it. It's on the exterior and the oil is dry but isn't really a hard film. I would now like to paint over it, hopefully with Resene X-200 which I have already. What prep and primers etc do I have to use to achieve this?

A. Based on what you have said I do have concerns about the adhesion of a pigmented paint system to the oiled surface. Resene X-200 is usually applied to a cementitious substrate and not timber; however it can be applied to appropriately primed timber. I would suggest allowing the oiled timber to weather for six months then re-check hardness; the oil should weather away or possibly fully harden over this time. The key is to ensure painting over the oil will not create another issue down the track.

Q. Due to lack of concrete cover, Nelson studs are exposed. Could you suggest a product that will provide a min 50 years durability and do you provide a warranty for this?

A. If the studs are accessible for maintenance painting then the 50 years durability is not required and a standard paint system can be used.

Q. Please advise a primer for previously painted sash windows and doors. These have previously been painted in gloss enamel. These windows and doors will have a top coat of Resene Enamacryl waterborne gloss.

A. Sand the windows then apply a full coat of Resene Quick Dry undercoat before applying the waterborne enamel topcoats.

Q. What do you recommend as a primer and topcoat for window security grills? Some have been previously painted while others will be new galvanised. The topcoat colour will be Resene Armadillo.

A. Use Primer Resene GP Metal Primer for bare metal. Then apply two coats of Resene Super Gloss enamel.

Q. What do you recommend as a primer/rust inhibitor for old cast iron lacework? Previously painted.

A. We recommend Resene Rust-Arrest.

Q. I need a topcoat for old cast iron lacework. What do you recommend?

A. We recommend Resene Super Gloss.

Q. I have a corrugated iron roof with old red paint on it. I want to remove the old paint and just have a grey coloured roof. What's the best way to remove the old paint - scraping, paint stripper? Do I need to repaint afterwards or can I just leave as is? I got a Stanley knife blade and scraped a section and it came off relatively easy but I didn't want to keep going if this method would make the iron rust.

A. If the paint adhesion is poor the high pressure waterblasting will be a quicker method to remove paint. The roof should be painted after removal of the red oxide paint as corrosion may well occur if left uncoated.

Q. Resene Lumbersider and Resene Sonyx 101 - which one would fade faster than the other one?

A. Fading is colour related and will be the same for both. However Resene Sonyx 101 as a higher gloss level product will take longer to start chalking compared to Resene Lumbersider in the same colour and exposure.

Q. I am looking to seal/prime a new plasterboard interior prepared for a paint finish with Resene Broadwall Surface Prep and Seal. Can this product be sprayed?

A. Yes Broadwall Surface Prep and Seal can be airless sprayed using an appropriate Graco sprayer.

Q. I'm about to paint my new home interior. What is your recommendation for Resene topcoats including the bathrooms, ceilings, walls, door frames and window sills? I want to use the Resene system throughout.

A. For wet areas (lined with Aqualine® or equivalent) the sealer must be Resene Sureseal. For these areas the topcoat must be a waterborne enamel. For areas above the shower I would apply a coat of Resene Quick Dry undercoat prior to applying the two coats of a Resene Kitchen & Bathroom waterborne enamel.

For all other wall areas you can use Resene Zylone Sheen. Resene SpaceCote Low Sheen is best for kitchens and hallways where extra burnish resistance is required.

Q. What product should I use to protect an outdoor concrete garden sculpture?

A. For a pigmented system: Apply a seal coat of Resene Sureseal then finish with two coats of Resene Lumbersider. Any release agents must be removed prior to application of the sealer.

Q. I have old varnished cane furniture. Can I use Resene Walk-on flooring and paving paint to paint it or should I use something different?

A. You will need to apply a coat of Resene Waterborne Smooth Surface Sealer first then you can apply a Resene waterborne topcoat to suit the end use.

Q. I have testpots for Resene Resolution Blue, Resene Turbo, Resene White and Resene Red Hot which I bought on Friday. The salesperson told me the paint was safe for children. I want to paint blocks with them. Could you tell me what kind of paint is in these testpots and whether it is safe for kid's toys?

A. The paint used in Resene testpots is a Resene Environmental Choice approved paint. Suggest that after painting that you leave the items to dry for two weeks then wipe down with warm water and a cloth before handing over to their future.

Q. I have cedar windows 38 years old. The white paint is flaking badly, down to the wood in many places and especially off the putty (probably acrylic as it's very hard). The previous owner had the house professionally painted but she forgot when. The cedar weatherboards, painted some time in dark brown, are in excellent condition so the paint can't be too old. I've stripped one window back to bare wood and applied Resene solventborne timber primer, white, plus two topcoats Resene Lustacryl waterborne semi-gloss enamel. Now upon reading the can I see a recommendation to first apply Resene TimberLock. I have a lot more windows yet to paint!

A. If after stripping the windows you thoroughly sand the cedar back to a near new condition then you can omit the Resene TimberLock, however inclusion of the Resene TimberLock will give extra protection to the base timber. If thorough sanding is not undertaken then application of Resene TimberLock will give robustness to the red paint system. I still suggest that, as a minimum, any areas of greyed cedar are sanded to remove loose surface fibres.

Q. What should I use to paint HDPE plastic? It's what the skis on my dog sled are made of. I want to paint them the same colour purple as the wood. I tried using spray paint but it isn't sticking so if they get knocked it just peels off. I also want a clear hardener type topcoat. What products do you suggest?

A. It is very difficult to get paint adhesion to this plastic. We have found that by heating the plastic surface to just melt using a gas flame that this chemically alerts the surface and allows for paint adhesion.

Q. I have a 1950s weatherboard house that I am stripping back to bare wood and repainting. At the moment I am doing the window frames. The wood is rimu throughout. Please recommend an undercoat and topcoat product. I get confused with primer, sealer, undercoat.

A. The best primer for Rimu would be Resene Wood Primer, then apply a coat of Resene Quick Dry undercoat and finish with two coats of Resene Enamacryl.

Q. I recently attempted to paint my mother's (plasterboard lined) internal access garage for her. The walls were fine, but when I began to apply ceiling white to the ceiling, the original paint started to 'flake'. I later noticed that even the areas I had cut in, around the light fittings (with a brush), had also blistered and started to crack.

A. I assume the ceiling was already painted? What you are seeing is the flaking of a previous coating. If it was not painted did you apply a plasterboard sealer before applying the ceiling paint?

Q. Can Resene Uracryl 404 be used on exterior board-formed precast concrete panels as an exterior clear sealer to protect against graffiti attack? The surface of the concrete will be slightly rough. There is no requirement for waterproofing, only anti-graffiti protection.

A. Yes but there are a few rules to follow; Apply a saturation coat of Resene Solventborne Aquapel and allow to cure for at least 48 hours before clear coating. Then apply a coat of Resene Uracryl 403 Gloss as the first coat and then follow with two coats of Resene Uracryl 404 Clear. The Resene Solventborne Aquapel helps to control the possibility of efflorescence and the first coat of Resene Uracryl Clear must be Gloss. This system will give a wet look to the surface. If this is not wanted then after the Resene Solventborne Aquapel treatment apply a full coat of Resene Concrete Clear Gloss and leave to cure for 48 hours before clear coating as above.

Q. Can I use black roof paint on an interior wall like the main bedroom in the house.

A. Resene SpaceCote Flat can be tinted to Resene Black. This is a better option for an internal wall paint than a roof paint.

Q. I have a 25 year old bare timber fence with algae and mould on it. What steps should I take to prepare it for painting please?

A. Treat with Resene Moss & Mould Killer to label directions. Some green algae can be difficult to wet out with the solution. If this is the case mist these areas first with water and a dose of household dishwashing liquid and while still damp apply the Resene Moss & Mould Killer. There should be a colour change to the mould and algae. Leave for 24 hours then scrub down using Resene Timber and Deck Wash following label directions.

Q. Can I paint flat enamel over flat acrylic ceilings to hold back nicotine stains?

A. It's best to use a coat of Resene StainLock or Resene Sureseal over the stains then you can stay with a waterborne ceiling paint.

Q. We purchased a house that had been repaired by Fletchers. They say that they have used a Resene X-200 paint. The repair has failed with cracking etc. EQC want us to repaint with this product but we would like a bit more confidence in it before we use it.

A. The cracking is not a paint issue but a reflection of either new cracking or a live crack that has occurred which has led to paint film breakage. Resene X-200 will bridge a gap but is only extensible to a given point. The best idea to contact your local Resene ColorShop and ask if a rep can visit to inspect.

Q. I've been told that a solvent paint type might be better on metal elements - steel grilles and cast iron - to inhibit water penetration that causes rust. What is your opinion on this? If solvent paint provides a better result, do you have a matt or semi-gloss solvent paint suitable?

A. Topcoat paints do not allow liquid water to pass through the dry film, only water vapour. Yes enamel topcoats which are cross linking do have a lower moisture vapour transmission rate than waterborne top coats. However with metal paint systems the primer is the main driver of corrosion resistance.

Like most paint manufacturers in this part of the world we only recommend full gloss solventborne enamel paints for exterior exposure. Lower gloss versions undergo severe chalking quickly if exposed to full weathering. On average even a full gloss enamel will show chalking after two years of direct exterior exposure. Waterborne paints have much longer times to the onset of chalking under the same exposure conditions.

Q. i am painting a home ceiling in a house built in 1998. The white ceiling has never been painted. I used a ceiling paint and soon after spraying on a yellowish checker board like pattern appeared. Tried to repaint a section and it still appeared. What are my options? Will a quality stain blocking primer eliminate the pattern?

A. Staining is probably is due to tannin leaching form the ceiling framing. If you apply a full coat of Resene StainLock then a flat Resene Ceiling Paint this should resolve the issue. Resene StainLock is waterborne. If you want a solventborne sealer then use Resene Sureseal. The primers will not give a solid opaque finish so will need to be overcoated.

Q. I need roof paint and exterior weatherboard paint to match COLORSTEEL® Slate. Do you have this please?

A. Yes we can match the COLORSTEEL® colour in most Resene exterior paints.

Q. Is it ok to add your bug repellent to CoolColour™ roof and wall paints?

A. It will have relatively short effectiveness if used in a roof coating.

Q. What sealer can I use to prepare previously polyurethane cork floor tiles for painting? I want to be able to either paint or whitewash over the existing flooring.

A. If using Resene Colorwood Whitewash then a thorough degrease and sand will be required.

Q. I mistakenly used metal, highly flammable, paint on the concrete around and under my wood burner stove. Should I try and remove it and what with? Is it dangerous as it is?

A. If the paint has fully cured with good ventilation to remove any solvents released from the paint then there should be little risk.

Q. What is the best type of paint to use on kitchen drawers and kitchen cabinet doors?

A. We recommend a solventborne enamel first followed by a waterborne enamel.

Q. I need advice on a suitable product to apply to marine ply. We have a large trailer box made of marine ply and we need the maximum weather protection from rain etc. The colour will be a dark NZ Army green.

A. We recommend two coats of Resene Quick Dry primer undercoat and two coats of Resene Sonyx 101 using a CoolColour™ version of the colour.

Q. We are renovating our home. We have extended our deck which is now supported on a steel girder and 4 heavy steel (stainless steel) posts. These are new and unpainted. What is the ideal primer?

A. Stainless steel is best left unpainted as the protective oxide layer on the steel is what gives this metal such a long corrosion protection time.

Q. We have an iron roof which has not been painted previously. There are spots of minor rust around the nail holes. The nails have been removed and replaced with stainless steel screws but I now need to paint the whole roof. What primer should I use? The roof faces north.

A. Using a 3M Rust and Paint Removal Disc remove loose rust from areas showing rusting and immediately spot prime with Resene GP Metal Primer then apply a full coat of Resene Galvo One and finish with two coats of Resene Summit Roof CoolColour™. The CoolColour version of the colour will not be cool to touch but will reflect more heat than the same colour made using non cool pigments and give the maximum time to the onset of chalking. The time to the onset of chalking is always quicker for a north facing roof, and is also influenced by the roof pitch.

Q. We have posts and beam that are galvanised steel not stainless steel and are unpainted. What would you recommend?

A. Prime with Resene Galvo One if you plan to then apply a waterborne paint colour. If the posts are not regularly rain washed apply two coats of Resene Galvo One. Also ensure that any areas of glossy galvanising are dulled off by power sanding with 100 grit sandpaper but do not over sand as this will remove zinc.

Q. We are replacing our guttering with COLORSTEEL® and using a hedgehog product as a leaf guard. The hedgehog is made of stainless steel and I have been wondering about chemical interaction between the COLORSTEEL® guttering and the hedgehog. Would it be advisable to prime the interior of the gutter?

A. There is a potential for dissimilar metal corrosion occurring between the stainless steel hedgehog and the COLORSTEEL® guttering. However the guttering inside is primed as part of the COLORSTEEL® production. If the inside primer is scratched then this is where the issue can arise.

Q. What paint should be used for my steel radiators which I would like to be white?

A. Resene Super Gloss or Resene Lusta Glo enamel.

Q. I need a metal primer red oxide flat finish.

A. We recommend Resene Rust-Arrest.

Q. I want to paint over powder coated aluminium in an interior dry area. What primer do I need?

A. Ensure the surfaces are free of contaminants then apply a coat of Resene Waterborne Smooth Surface Sealer (the sealer is not designed to be opaque or to give a high film build), leave to cure for 48 hours then apply two coats of Resene Lustacryl (semi-gloss) or Resene SpaceCote Low Sheen.

Q. I am in the process of prepping our garage to repaint and I want to check what sort of paint I should use. I have used paint stripper (the old paint was cracked and had about five layers of paint on it), then we waterblasted it to clean any remaining stripper off. I've then sanded it and rinsed the dust off with a hose. Some parts of the sanding and stripping have left the bare wood showing which is a red/brown colour. I think the garage was probably built around the same time as the house in 1969. What should I use?

A. Apply a full coat of Resene Quick Dry waterborne primer undercoat and then finish with two coats of Resene Sonyx 101 or Resene Lumbersider.

Q. Do you have a product that can be used on terracotta tiles? They are outside, unsealed and subject to foot traffic.

A. Ensure the tiles are clean and apply a seal coat of Resene Sureseal and then finish with two coats of Resene Walk-on.

Q. What sort of paint should I use to paint a material covered pin board please?

A. A waterborne paint such as Resene SpaceCote Low Sheen is recommended.

Q. I am painting white sash windows over 100 years old, which are inside in a bathroom. Am I best to use oil/solvent or acrylic paint and as some areas are back to the original wood and others perfect white paint do I need to prime the whole sash or just the areas of bare timber before undercoating? Finally do I need to totally remove the sash to paint them properly given the paint extends to areas I can't access where it slides up and down in the frame?

A. You will need to prime any bare timber. The timber type will dictate which primer to use. The existing paintwork is probably an oil based paint system and may well have underlying layers of paint that contain lead. If you have a flake then I suggest that you get it tested for the presence of lead.

Q. NZBC D1 and NZS 4121 state that doors must have a colour contrast for visually impaired people. The contrast needs to be 30% based on LRV values. Do you know of a formula that I can apply to check this based on the LRVs?

A. LRV (Light Reflectance Values) do work on a 0-100% scale and are a measure of what the colour looks like. So if you need a contrast of 30% LRV then you would need a colour of say 40 LRV and 70 LRV to give the required colour contrast difference of 30% LRV.

However if you have an LRV change of 30 you could end up with a dark green and a lighter green, which wouldn't necessarily be enough contrast for someone who is colourblind. Ideally as well as a strength difference, you would also use contrasting colours (e.g. yellow with blue), different sheen levels and good lighting to help emphasise the colour contrast.

In our colour codes – e.g. B54-058-237 The '54' is the luminance (which is similar in many ways to LRV), the middle part '058' is the saturation and the '237' is the position on the colour wheel. Each of those elements can be used to compare colours to add additional contrast.

LRVs only normally apply to solid colour finishes, not stained finishes. Some suppliers measure LRV by different standards, so if you are comparing LRV across two brands that will be used side by side and need to be contrasting you may need to check how they are measured or do a visual check to ensure they provide sufficient contrast.

You can view Resene colours by reflectance value in our online colour library - this would give you a quick reference to what colours at various LRV values look like.

Q. I am researching paint for artwork on footpaths for my town. Can you please tell me what type of paint would be best suited? I need to present all information to the council before we can proceed with design.

A. We have two options, Resene Non-Skid Deck & Path or Resene Walk-on. Both are permanent paint coatings and not easily strippable.

Q. I have a wall to paint in an office. The colour will be Resene Turbo. The customer would like it to be writable. Do you have a clear whiteboard type paint that will be able to be written over and erasable?

A. We recommend Resene Write-On Wall Paint.

Q. I've recently bought paints to paint my house. I'm painting old cedar weatherboards and have been advised on the products required to do the job. The topcoats are two days old but if I scratch the surface with my finger nail the paint comes off and you can see the primer underneath. Will the topcoats harden and become more resistant to abrasion over time?

A. The adhesion of our waterborne paints takes 5-7 days to develop. This is influenced by temperature and film thickness.

Q. We have a part cedar weatherboard home. The cedar when installed was precoated with Machinecoat by the supplier. Scrubbing with Resene Timber and Deck Wash has virtually removed the coating on the sunny side, not so much in the shade. We were told to continue with oil based and have coated a couple of walls with Resene Woodsman wood oil stain. This has not really achieved the look we had in mind. Is it ok to recoat and finish other walls with Resene Waterborne Woodsman? We intended using the waterborne in the first place but didn't as we understood it was water based. Having since read the data sheets we now know both are penetrating oil stains.

A. You can use the Resene Waterborne Woodsman version after the scrub down with Resene Timber and Deck Wash following label directions. Resene Woodsman stains are designed to erode upon weathering, the erosion rate is more pronounced on the elevation that receives the most direct weathering.

Q. I am painting our weatherboard garage. The garage was built around 1969 so we think the wood is cedar or kwila. I have undercoated with Resene Wood Primer general purpose and have just started topcoating in Resene Lumbersider waterborne low sheen. However the paint appears to be separating when I first apply it and if I wait 3-4 mins and then go back over it, it appears to be ok but I am worried it's not sticking to the undercoat as it should. Could you please advise if this is expected?

A. At this time of the year the drying of oil based primers can be slow and they can dry to leave an oily film on the surface which can repel a waterborne topcoat. If the waterborne paint film is well worked this can result in standard adhesion. If there are areas of untopcoated but primed boards scrub down with Resene Paint Prep and Housewash following label directions then apply the topcoats.

Q. How do I remove Resene X-200 that went on to my window framing?

A. Resene X-200 should be removable by wiping with a cloth and methylated spirits. Note that if the underlying paint is also a waterborne coating that this will also possibly be removed.

Q. I have used your metallic effects on a rendered concrete garden bed. After a few months the paint has started turning black in certain parts of the wall. Why is this happening? It has been three months since I painted it and only now has this started happening.

A. Did you apply a sealer first? If not then the alkalinity of the concrete is reacting with the metallic flake in the Resene Enamacryl Metallic.

Q. I have rough sawn treated pine weatherboards on our house which were last stained 25 years ago. What would you recommend I paint it with, oil based or water based?

A. I expect there will be mould growth to deal with so treat this with Resene Moss & Mould Killer diluted and used to label directions. Then scrub down with Resene Timber and Deck Wash diluted and used to label directions. Then if restaining apply 2 coats of Resene Woodsman wood oil.

Q. Where we have used Resene Lustacryl on interior doors with wood grain pattern but not true wood and we want to paint after 11 years, do we need to prime again or can we just apply a further two coats? This product has been very good but with family wear and tear and EQC work we would like to repaint the doors to be in line with the rest of the house.

A. Clean down using Resene Paint Prep and Housewash to label directions then apply a coat of Resene Quick Dry primer undercoat before recoating with Resene Lustacryl.

Q. When painting glass is it good to thin the paint so it sprays without spitting and put on more than two coats?

A. When spraying all paint should be thinned with the correct thinner to achieve good atomisation. Paint should be applied to achieve recommended coverage.

Q. We are demolishing an old house on a property in the country and were going to remove the old doors which have a lot of character and use them as table tops in a cellar. I am assuming they haven't been painted for 40 years so would have been painted with lead paint. Is there any danger in using them if we just clean them up with soap and water as they are very dirty? Also once cleaned is there any risk to anyone if the paint is left undisturbed?

A. There will be a risk of lead release if the paint layer is chalked or disturbed. Cleaning down with water and a detergent should not pose any appreciable risk again as long as the paint surface is sound. However we cannot comment on the future risk of lead contamination if the old painted surface is used as a table surface but would suggest that the paint should be removed to avoid any future risk. This is best undertaken by a commercial paint stripping business.

Q. Can I paint an internal wall that's cream low sheen acrylic with a burgundy low sheen acrylic or do I have to use an undercoat?

A. Two coats at the recommend coverage rates should give coverage over the cream base colour.

Q. I have to paint a ceiling in a bathroom where the previous paint seems to have been some sort of gloss. The issue is that previously there were smokers in the house and there are nicotine stains. I have washed it several times which took off a lot, and sanded it (lightly) but you can still see the paint has that nicotine colour tinge to it. What would be the best sealant before I repaint it, presuming you would need one to stop it leaching through?

A. Yes it definitely needs to be sealed and we recommend a coat of Resene Sureseal.

Q. If I get a drip using latex paint how long should I wait to sand and repaint?

A. Some waterborne paints never really get hard enough to sand or if sanded can soften and glug up the sandpaper. Wet sanding using wet and dry paper is the best way to sand back and this can be done after a few days of drying.

Q. A splashback was painted but there was a small mark on the glass. So the paint was removed and the painting redone. The colour was lighter than the first time. Why is this?

A. The only reason is there must have been residual paint or contamination from the stripping step.

Q. To bring our steps up to Health and Safety standards I need to paint a 50mm strip along the front of each tread. Some are steel checker plate and some are on tiles with grip type nosings. Both are external stairs. What is the best product for both situations?

A. The 50mm stripe can be Resene Uracryl 402 and if needed broadcast Resene SRG Grit into the wet paint film for traction.

Q. We have a closed in trailer. We are looking for a product to reduce the heat on the roof as it's black and also to waterproof the joins. Is there such a product available?

A. The best reduction will be achieved by painting the roof white - white reflects 100% of light, black absorbs 100% of light. Use an Automotive joint seal for the leaks.

Q. Is the wood stain Resene Pickled Bean a penetrating stain or a film forming stain and would it be suitable to use on a Shadowclad® Ultra Groove ply external cladding?

A. Resene Woodsman is non film forming and suited to stain Shadowclad® provided that the material is not used as a bracing element but as a cladding.

Q. I have just rendered an outside table and was wondering what would be the best product to seal it with? The render is multipurpose acrylic render so I am not sure if it is a concrete/plaster mix. Would Resene Concrete Wax be suitable?

A. Resene Concrete Wax needs to be applied to all surfaces to seal the render and is suitable and has the advantage that it is readily recoated in future as required by usage/age etc. If it is a concrete/plaster render then use Resene Concrete Clear.

Q. Can you please let me know what the Resene product for grit onto a Decramastic tile is?

A. We do not have a paint with the same grit size that would have been used to produce the roof tile. But Resene Resitex Standard may be a similar match.

Q. Do you have a waterbased product to paint woodgrain Hardiplank® to give it the appearance of timber?

A. We would recommend Resene Forester.

Q. Can I use waterbased varnish over solventbased varnish?

A. Yes as long as the solventborne is sanded to provide a mechanical key for the new clear.

Q. I am painting an aluminium garage door 30+ years old which is oxidised. What prep will I need to do?

A. You will need to apply Resene Roof and Metal Wash as per label instructions, wash clean with fresh water, prime with Resene Galvo One primer and apply two coats Resene Lustacryl semi-gloss waterborne enamel.

Q. I have a shipping container that I am using for storage. What type of paint should I use to repaint it? I want to use a light colour, to aid in keeping the temperature down inside and cover a few rust spots.

A. If any areas of moss or mould infestation exist then treat them with Resene Moss & Mould Killer diluted and used to label directions. For heavy infestations more applications may be needed. Scrub down using Resene Paint Prep and Housewash diluted and used to label directions. Rinse clean or hose down with fresh water ensuring all salts are also removed. All paint that is flaking or unsound must be removed by using mechanical methods, (3M Rust and Paint Removal Disc), chemical stripper or high pressure waterblasting taking care not to damage either the substrate or the surrounding areas. Remove all areas of white corrosion material and as much red rust as is practicable and all paint that is flaking or unsound must be removed by using mechanical methods, (3M Rust and Paint Removal Disc), chemical stripper or high pressure waterblasting taking care not to damage either the substrate or the surrounding areas. Where under-film corrosion is taking place the existing paint must first be removed as above and remove under film corrosion products taking care not to damage sound zinc coated areas. All paint edges must be feathered to a smooth finish.

Note: The performance of the subsequent paint systems will be largely dependent on the thoroughness of this surface preparation stage. Ensure all edges of damaged paint are sound and immediately spot prime all areas of corrosion and any other bare metal with a full coat of Resene ArmourZinc 110. Apply a full coat of Resene Galvo One and two coats of any Resene exterior waterborne paint.

Q. We have a new butynol roof over a porch. The builder has waterblasted it but it's marked so he recommends painting it with a primer and two coats of acrylic topcoat. Is this a good idea? Also the guttering above this leaks but he doesn't seem too keen to fix the leak in the joins, so there are wet patches on the roof every day. The builder seems to think this is not a problem but we don't think painting a wet roof is advisable. Is it still advisable to paint the roof even though it's wet with puddles of dew each morning?

A. We do have a waterborne paint system for butynol. We recommend a coat of Resene Membrane Roofing Membrane and two coats of any Resene exterior waterborne topcoat paint. However if the roof is wet at the time of painting and remains wet during the drying then the paint system will be washed from the butynol. However once dry and cured the system is suitable for exterior exposure.

Q. We have a lunch room of approx 11sq metres, and it is next to a cold room and freezer. The floor, which had vinyl which has now been lifted because of mould smell, has been cleaned. We are looking for a dark grey epoxy or similar.

A. Treat for mould if present, allow to dry out, then diamond grind, then apply Resene Aquapoxy for Flooring.