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Answers to your questions from our Tech Experts


Here’s a taste of some of the Technical Expert questions and answers to help you with your own projects. Always make sure you read the product label and data sheet prior to application. If in doubt about any aspect of your project, please ask our Technical Expert for help or come in and see our staff at your local Resene ColorShop or Reseller.

 
 
 

 

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Q. I'm painting a kauri door; I've taken it back to wood and am ready to prime and paint. What's the best product to use, primer and paint?

A. Prime with Resene Wood Primer, then apply a coat of Resene Quick Dry and finish with two coats of Resene Lustacryl.

November 2018

Q. We have a small outside terrace covered with Firth concrete pavers that we want to paint. We will want it to be able to take light foot traffic. What paint system would you advise please?

A. Use a seal coat of Resene Sureseal then two coats of Resene Walk-on.

November 2018

Q. How long can you paint and then leave Resene Quick Dry Primer on the exterior of your house exposed to weather before applying a colour coat? I have just done Resene Quick Dry primer but am going to now have two weeks before I can apply my Resene Lustacryl colour coats. Will this be ok? Or what difference could it make?

A. A two week time before the Resene Quick Dry primer is overcoated with Resene Lustacryl should be no problem.

November 2018

Q. I am looking to paint a large wooden doll house that we have. It was made about 30 years ago. Can you advise what paint is best for this application? i.e. safe for kids.

A. We recommend Resene Lumbersider.

November 2018

Q. I understand there is a two stage paint application coating for a home theatre wall that the projector shines onto. Do you have such a product? Our wall area is approximately 3m by 3m.

A. We do not have a special system for this application but for many years have recommended application of two coats of Resene SpaceCote Flat tinted to Resene Silver Sand for projection walls.

November 2018

Q. We have a COLORSTEEL® roof that is about 15 years old. It is in reasonable condition but has some lichen on it. Is it normal to re-paint this kind of roof? I was going to get it cleaned and see how it looks then. Does one get any reasonable extended life if it is painted?

A. Lichen will need to be treated and then removed; lichen can be difficult to kill. We suggest that the lichen is treated with Resene Deep Clean diluted and used to label instructions. Apply on a dull day to give the longest wet contact time with the lichen, if the infestation is heavy apply then re-apply the diluted solution a few hours after the first. Then leave the roof for at least 4 weeks and waterblast. This should result in removal of dead lichen residues and give a surface suitable for painting. Apply a full coat of Resene Galvo One and finish with two coats of Resene Summit Roof colour.

This system is recommended as the surface condition is sound and there are no signs of corrosion.

November 2018

Q. I have an extensive deck area. There is an original painted deck that is weather worn and about 20 years old and a new deck extension about 5 years old. I want to make both decks roughly the same colour. Can I use decking stain to do this or will I need to paint them?

A. You will need to completely strip the paint from the old deck if you want to change to a deck stain.

When staining, the base timber colour will influence the stained colour so if there is a difference in timber colour then the two areas may not appear the same colour even if stained with the same stain colour.

November 2018

Q. I'm looking at painting my floorboards white and I'm looking for some advice as to what primer I should use with your 'walk-on' paint for best results and to prevent tannin.

I'm unsure what kind of wood I have in my 1960s house, half of the lounge has been stained (from what seems like an oil varnish) and the other half is an extension which doesn't look to have been stained (or have any coating applied).

A: You will ned to sand both floors to profile for recoating, then apply a coat of Resene Quick Dry waterborne primer undercoat or Resene Wood Primer (if you suspect tannin bleed will be an issue) then apply two coats of Resene Walk-on and finish with a seal coat of Resene Concrete Wax.

Tannin bleed from bare timber usually only occurs with cedar. We have not seen any instances where internal flooring timbers have tannin bleed issues. Suggest you try a small test area to confirm.

Resene Quick Dry can be used as the primer if the existing clear coated timbers are degreased and sanded to profile.

November 2018

Q. I am going to paint my deck with Resene paint. Someone suggested to me using Resene Lumbersider for finish coats, the other one said using premium semi-gloss. Please you could tell me which one is the best for deck painting? My deck is under the sun nearly all day every day.

A. Resene Lumbersider is often used as a deck paint; while not designed for a trafficable area is does perform well and can easily be recoated when required. As you increase the gloss level to a conventional waterborne semi-gloss the coating does become softer and has reduced wear resistance compared to Resene Lumbersider.

We recommend using the Resene CoolColour™ version of the colour when applying darker colours. The Resene CoolColour topcoat will not render the painted surface cool to touch but the CoolColour version will reflect more heat than the same colour made on non-cool technology. To get the maximum heat reflections apply the two coats of CoolColour top coat over a white base coat such as Resene Quick Dry primer undercoat.

November 2018

Q. Can you advise me which standard you use for your Light Reflective Values?

A. Resene light reflectance values are measured from each colour standard using a spectrophotometer and are the CIE Tristimulus Y value (brightness) of the colour. This value is Resene's measure of Light Reflectance.

November 2018

Q. We are using kwila timber in a bathroom area. What would you recommend to coat it with?

A. The only product we would recommend is Resene Polythane (four coats).

November 2018

Q. Which two pot aqua system is best for an old fibreglass trailer boat which is sanded, plus which undercoat please?

A. We recommend Resene Armourcote 821 and Resene Waterborne Uracryl 803.

November 2018

Q. I have an old Namco aluminium sun lounger that the green paint has almost gone powdery after twenty years, but otherwise is still in good condition. I would like to repaint it. Can you suggest a paint that I could use and what prep I would need to do?

A. Scrub down using Resene Roof and Metal Wash diluted and used to label directions to remove surface chalk. Then apply a coat of Resene Armourcote 221 and finish with two coats of Resene Uracryl 402.

November 2018

Q. I am trying to remove efflorescence on a block concrete wall in my garage but it keeps coming back! Are you able to advise the best treatment please?

A. Efflorescence occurs when water passes through the wall and brings soluble salts to the interior face where they crystallise after the water evaporates. The best way to stop this is to render the exterior face of the wall weathertight with a Resene X-200 paint system.

After preparing the areas showing efflorescence back to bare concrete, spot prime with Resene Sureseal then apply the Resene X-200 system. Resene X-200 can be left as a finish coat and tinted to a large number of Resene colours.

November 2018

Q. I’m looking at painting my ceramic floor tiles in the kitchen and bathroom a different colour and wondered what kind of paint I’d need for that and if you stock these products? It is currently a beige yellow colour and I want more of a grey concrete look.

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 over coating. The sealer is not designed to be applied as a thick wet film thickness or give opacity, the thinner the coat the better.

Then apply two coats of Resene Lustacryl.

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.

November 2018

Q. I’m doing a large painting on canvas, it will probably measure 1m by 2m. I’m using Resene testpots as my colours for the image but I think I’ll need to seal it. What clear product would you suggest I use for topcoat? I’m trying to make a backdrop like picture, for a work Xmas party and it may only get used once but I want it sealed in case it gets rain on it.

A. If you have a total cover of the canvas with paint, then this should give a seal to liquid water. You could apply a coat of Resene Clearcoat UVS over the completed paint system as a protective clear but this will result in a gloss finish.

November 2018

Q. We we wish to repaint the exterior of our aluminium clad Lockwood home. It was repainted 15 years ago with Resene Uracryl 403. The surface is now powdery with bare aluminium showing through. What system can we repaint with? Ideally I would like to go with a waterbased system, or at least single pot. Also we have very weathered varnished soffits, which we plan to just paint. What paint system would you recommend for this?

A. Thoroughly scrub down the walls using Resene Paint Prep and Housewash diluted and used to label directions to get a chalk free surface. You may have to do this more than once. Then apply a full coat of Resene Quick Dry and finish with two coats of Resene Sonyx 101. We suggest avoiding selecting a dark topcoat colour.

Re the soffit linings, wash down with Resene Paint Prep and Housewash, then thoroughly sand, apply a coat of Resene Wood Primer and finish with two coats of Resene Sonyx 101.

November 2018

Q. We have a couple of internal decks and an area of roof that are covered in Butynol membrane. This is all structurally sound, however is starting oxidise slightly. Some powder comes off if you walk on these surfaces. Rather than replacing at this stage, is there a Resene product or system that can be used to refresh this material?

A. Scrub down using Resene Paint Prep and Housewash diluted and used to label directions then apply a coat of Resene Membrane Primer and two coats of Resene Lumbersider. If using a dark colour topcoat apply the Resene CoolColour™ version of the topcoat colour. The CoolColour topcoat will not render the painted surface cool to touch but the CoolColour version will reflect more heat than the same colour made on non-cool technology.

November 2018

Q. We have an old house with what looks like Artex on the ceiling. It is discoloured but don't think it is from cigarette smoke and definitely not grease, just age. I want to repaint using ceiling white but I’m not sure how to clean it. Can we just paint right over it with the ceiling white? I am a bit doubtful about wetting it and am sure scrubbing it would make it break up.

A. Apply a full coat of Resene Sureseal then two coats of Resene Ceiling Paint.

The ceiling should be degreased using Resene Interior Paintwork Cleaner then the Resene Sureseal applied. Resene Sureseal is recommended to block possible stain migration into the waterborne topcoats.

November 2018

Q. I wish to paint an outdoor foot traffic area with Resene Walk-on. It has been coated previously, probably with waterbased coating, as the surface colour can be rubbed off with meths. There are some areas of bare concrete and some patching of cracks needed, plus a general clean-up.

Can you tell me the best process to adopt, from cleaning to undercoating to topcoating?

A. Scrub down using Resene Paint Prep and Housewash diluted and used to label directions then waterblast. Spot prime bare concrete with Resene Sureseal then apply two coats of Resene Walk-on.

Without seeing out the cracks and filling with cementitious filler such as Resene Multistep, crack repairs will be difficult to achieve.

November 2018

Q. I am painting the brick exterior of my house. I have a whole 4L tin of Resene Waterborne Smooth Surface Sealer left over from some other renovations. Can I use this to prime the bricks instead of Resene Sureseal?

A. If the bricks are glazed, then yes to using Resene Waterborne Smooth Surface Sealer as the adhesion primer, if not, then if relatively new bricks apply a coat of Resene Concrete Primer thinned 10% with water as the seal coat then finish with two coats of Resene Sonyx 101 or Resene Lumbersider.

November 2018

Q. We are building a new house using band-sawn ply with battens (AlpineClad). We would like to retain a natural timber look that will not require continual maintenance. The site is only 100 metres from the sea.

A. Staining would be the closest to a 'natural' look but given your proximity to the sea and requirement for a low maintenance system, I would not go with staining but a solid colour finish.

November 2018

Q. We have a red brick exterior house which we are considering to paint off-white. What products do we need i.e. do we need a sealer before painting the brick?

A. Assuming the bricks are not glazed, wash down using Resene Paint Prep and Housewash diluted and used to label directions, allow the bricks to dry out then apply a primer coat of Resene Concrete Primer thinned 10% with water and finish with two coats of Resene Sonyx 101 or Resene Lumbersider.

November 2018

Q. I have a piece of totara to use as a signing book for a wedding. It has been varnished with Resene Aquaclear waterborne urethane for interior and I was wondering if I needed to do anything else to it before using a fine tip sharpie ornament marker pen on it.

A. We have never looked at this application but it should be fine. You may want to check on a piece of pine or an off-cut of timber first.

November 2018

Q. I have an old cork floor and would like to get a new look - do you have a paint product that would work on it? The floor is clear coated, and I would like a white finish, and it is in kitchen, dining and bathroom areas.

A. Degrease and sand with 180 grit sandpaper to profile for recoating then apply a coat of Resene Quick Dry and finish with two coats of Resene Lustacryl.

November 2018

Q. I have old aluminium window frames that I wish to paint white, to match my new windows - how would you suggest I do that? Presently they are silver.

A. Scrub down using Resene Roof and Metal Wash diluted and used to label directions (do not allow the wash solution to dry out on the window glass) then apply a coat of Resene Vinyl Etch grey and finish with two coats of Resene Lustacryl.

November 2018

Q. I have a new concrete patio. To prevent marking or staining is there a clear finish that can be applied?

A. We recommend Resene Walk-on Concrete Clear. The concrete must be fully cured before application. This normally requires 28 days.

November 2018

Q. I want to paint PVC exterior downpipes, what paint systems do you recommend? Would it need to be sanded first? Is there a one stop paint/primer that can be used?

A. Resene exterior waterborne paints such as Resene Sonyx 101 or Resene Lumbersider can be applied (two coats) direct to clean PVC without the need for sanding the PVC or priming.

November 2018

Q. Do you need to sand before painting over Resene Waterborne Smooth Surface Sealer? I've prepped a chair with it and am using Resene Lustacryl.

A. Resene Waterborne Smooth Surface Sealer is designed to be applied to achieve a low dry film thickness and we do not recommend sanding the sealer coat.

November 2018

Q. I purchased Resene Summit Roof semi-gloss waterborne roof paint. I have more than enough. Can I use this paint on timber?
Or is it only for roofs?

A. Yes it can be used as the topcoat for appropriately prepared and primed timber.

November 2018

Q. I'm looking for a finishing product for a 21 m2 Vitex Timber deck which was laid two weeks ago. If possible, I would like to keep the natural look of the timber. Are any of your products suitable for it?

A. There are no water white clear stains for exterior timber decking, Vitex will change colour upon exposure to UV. Our suggestion is to prepare the decking timber by washing with Resene Timber and Deck Wash then apply two coats of Resene Woodsman Wood Oil in a colour that meets your requirements.

November 2018

Q. We have had to re-putty a sash on a leadlight window which was painted about 10 years ago in a Resene CoolColour Nomad. We have some of the paint left but no primer or undercoat. Could you suggest what we need to re-paint the sash with?

A. If using linseed oil sash putty, allow the putty to cure to develop a skin, then prime with Resene Enamel Undercoat before topcoating.

November 2018

Q. I have some rust stains leaching through white timber window frames presumably from the fixings. This is after about 10 years. The frames have been originally primed and painted and were repainted about two years ago. What would I need to do to remedy this and is there a block-out/primer I can use without major surgery?

A. This is a common problem seen with older windows. To rectify the fixings long term, hinges should be replaced with stainless steel versions.

If this cannot be done, then apply a barrier primer such as Resene GP Metal Primer over the area showing rust staining, then reapply topcoats. This is only a cosmetic fix.

November 2018

Q. I'm having a sleep-out built and the builder has said I can oil the macrocarpa floor. I went to a shop to buy the oil and was told I couldn't do this; I'd need to stain and then use polyurethane. I don't want a highly polished surface.

A. You could apply two coats of Resene Danska Teak Oil.

November 2018

Q. I want to whitewash my rimu timber wall panelling. Do I need to sand back the varnish finish first? What product(s) should I use?

A. Clean down using Resene Interior Paintwork Cleaner then sand using 220 grit sandpaper to profile for recoating, you don’t need to sand off the existing clear. Then apply Resene Colorwood Whitewash.

The key is to apply an even wet film and avoid overlaps, as overlaps will show as a more intense white area.

November 2018

Q. I want to oil a bare cedar boat mast. If I apply Resene Woodsman acrylic oil stain will it give any protection or does it just make it look good? What would be your recommendation? I would rather not varnish it if it can be avoided.

A. I would suggest you use Resene Woodsman Wood Oil for this application, as it gives a more stained look than the waterborne version. Both versions are high maintenance requiring regular coating to maintain the system. The stain also gives protection against bio growth and UV degradation of the substrate.

November 2018

Q. If we apply Resene Concrete Stain (solventbased) in a colour over an old concrete floor, can we protect it further with Resene Concrete Wax (waterbased) or is this not recommended or necessary?

A. It should not be necessary to overcoat the Resene Concrete Stain but if you want it you can use Resene Concrete Wax. Ensure the stain is fully dry and all solvents released before overcoating.

November 2018

Q. The house we bought has two toned bedroom walls with a strip of wallpaper. I want to paint it something more neutral, but I'm concerned about the big difference between the lighter paint and darker paint. Will it be possible to paint one colour over the whole wall?

A. Prime the border with Resene Vinyl Wallpaper Sealer and then apply a full coat of Resene Quick Dry to balance the existing colours for over coating. Then apply two coats of Resene SpaceCote Low Sheen in the new colour. 

If the border has a texture you will see the border texture through the new paint system.

November 2018

Q. I have some wooden windows being installed on my property and they come pre-primed with one of your products - the AquaLAQ NGR Primer Sealer. Could you tell me the best way of topcoating this?

A. AquaLAQ NGR was originally designed as an OEM spray applied primer for MDF (furniture) which was then sprayed and top coated with AquaLAQ topcoat colours.

The priming/topcoat painting would be undertaken in a furniture coating shop and the painted items then sent out to site for installation.

The primer can be used for shop priming of timber (joinery) where a durable fast dry priming system is required. An alternative Resene paint system is required for this situation. The system is a coat of Resene Quick Dry primer undercoat and then topcoat with two coats of Resene Lustacryl.

November 2018

Q. I have a situation where there is a steel PFC bearer for a house extension where the drawings call it as 'Galvanised" however due to time constraints, the builder wants to paint the steel instead. The steel in this case would not be sealed off due to the subfloor venting (20mm air gap) and the PFC being approximately 1m off the ground.

The steel manufacturer has proposed two paint products which I would hope you'd be able to advise/provide some advice on which one would be more appropriate to use in my situation. The products are Resene ArmourZinc 120 and Resene Armourcote 220.

A. The suggested paint system is fine but the issue is the degree of surface prep that will/can be undertaken. The anti-corrosion protection is directly related to the degree of surface preparation.

At a minimum the steel work must be free of mill scale and if there are corrosion products present these are to be prepared to leave only tightly adherent material on the surface.

The components of the paint system must be applied to achieve the required dry film thicknesses. Both products are formulated for spray application, if brushing multiple coats will be required to achieve the DFTs.  Make sure you read the product data sheets before application.

November 2018

Q. I have a Formica® benchtop in excellent condition and hate the colour.  I would like to paint it, then protect with three coats of Resene Aquaclear.  How should I proceed?

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 curing without water contact for at least 48 hours before over coating. 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 and this cannot be restored by application of clear overcoats.

November 2018

Q. My son has recently bought a new home and two of the rooms have sliding mirror built in wardrobes. I would like to paint these mirror surfaces. What Resene product should I use for priming and topcoat?

A. Clean the glass down with meths to remove oils from handling.  Apply a thin coat of Resene Waterborne Smooth Surface Sealer then two coats of Resene waterborne enamel. This system will work on glass but we have not tested it on mirror glass.

November 2018

Q. I’ve just bought a step stool for my 2-year-old to use, climbing on and off the bed etc. It’s made of solid aspen wood with no coating. I would like to paint it, but would need to use non-slip paint - does Resene have a product that could help with this?

A. Assuming the timber is uncoated apply a primer coat of Resene Quick Dry then two coats of Resene Non-Skid Deck & Path.

November 2018

Q. I want to paint a bathroom wall with Resene Kitchen & Bathroom waterborne paint. However, I suspect the current paint on the wall is oil based. Can I paint this water-based paint over oil-based if I use Resene Waterborne Smooth Surface Sealer as an undercoat? If yes, do I need to do anything else as prep? It no, is there something else I could use as an undercoat?

A. Ensure the existing paint surface is cleaned to remove any surface residues using Resene Interior Paintwork Cleaner then sand with 180 grit sandpaper and dust off. Then apply a full coat of Resene Quick Dry primer undercoat and finish with the two coats of Resene Kitchen & Bathroom waterborne enamel.

November 2018

Q. I am after a paint system for HardiPanel® compressed sheet to the ends of the gable roof. 

A. Our standard paint system for this substrate is to apply a primer coat of Resene Concrete Primer and finish with two coats of a Resene waterborne enamel such as Resene Sonyx 101.

November 2018

Q. I have an exterior concrete area, which has become patchy and looks porous. I would like to purchase a tinted concrete seal that will not cover up the white squares, but provide an even glossy looking coat. I am okay with the concrete colour looking patchy, as I quite like it like that, but I want the finish to not be so porous. So I am thinking a tinted concrete sealant.

A. Try Resene Walk-on Concrete Clear Wet Look.

November 2018

Q. My interior basement block wall has damp coming through in various spots and the paint has started to peel/flake in places. I am wondering which paint/product option would be the best to apply to stop this.

I am looking at Resene X-200 or do you have something better or more appropriate that will stop the damp coming through e.g. Resene HydraBlock?
 

A. Resene X-200 is not the product to use when you are looking for a barrier coating for interior application to prevent water ingress. The product to use is Resene HydraBlock.

November 2018

Q. We are putting down a new macrocarpa deck. What stains or oils do you have that work best with it to prolong the silvering off? The exterior cladding on one wall will also be macrocarpa so will it need a similar treatment?

A. We recommend Resene Woodsman Wood Oil for both decking and walls.

November 2018

Q. I’m painting my bathroom which has a new ceiling. Can you tell me which undercoat and paint to use on plasterboard with some new plaster over screws and joins?

A. Apply a seal coat of Resene Sureseal followed by a full coat of Resene Quick Dry primer undercoat and finish with two coats of Resene SpaceCote Low Sheen Kitchen & Bathroom.

November 2018

Q. I am preparing matai or rimu sash windows on the outside. The house 100 years old, what primer do I use?

A. We recommend Resene Quick Dry primer undercoat. You can then topcoat with either solvent or waterborne enamels.

Matai contains a natural anti-oxidant which prevents the drying mechanism of a solventborne wood primer such as Resene Wood Primer, however this primer can be used for priming rimu.

November 2018

Q. I’m about to start painting and have a number of doors that were varnished many years ago. Will light sanding suffice or will I need to do more than sand as preparation?

A. Degrease using Resene Interior Paintwork Cleaner, paying particular attention to areas of hand contact, sand to de-gloss then apply a coat of Resene Quick Dry.  Then you can topcoat with either water or solvent borne enamel systems.

November 2018

Q. My friend and I are doing a project for school and we are going to collect plastic bottles and turn them into more useful things to help the environment. We were wondering if you have any paint we can use to decorate our plastic bottles, to make them look more appealing, it would be good if the paint was waterproof so it can last in outdoor areas.

A. Your project sounds very interesting. The adhesion of a waterborne paint depends upon the plastic you are looking to coat.

I suggest that as a starting point, that you get a Resene testpot and apply it to the plastic bottles you have, to check adhesion. Apply the paint and then check adhesion after 4-5 days. Apart from adhesion, the other issue may be the flexibility of the plastic compared to the paint.

November 2018

Q. We have a block wall on which we have applied Resitex, could you please advise how we can remove this product from the blocks? Is there a paint stripper we can use?

A. Use of paint strippers can be messy as the stripper often only softens the waterborne paint which is usually then required to be scraped off.

The other option is waterblasting with sand injection but care must be exercised so as to avoid leaving an aggregate rich concrete surface.

December 2018

Q. Our students have done a community mural that will be put up at our local MP's office. They have painted on corflute and want to protect it with some sort of graffiti guard. What product do you have that would do the job?

A. Resene Uracryl GraffitiShield is the anti-graffiti clear that can be applied over an exterior waterborne system such as Resene Lumbersider. The product is a two pack clear and mixing and application does require care and a level of skill, so we would recommend this is done by adults.

The higher gloss level finish will give the most durable anti-graffiti system.

December 2018

Q. We have built a new solid timber home and are using interior Resene Colorwood Whitewash on all of the walls inside. We have started and have applied one coat as per the tin's instructions. But have noticed it does say on new timber overcoat with two coats of Resene Aquaclear. Do you think we should do this on all of the walls throughout the house?

We have also used the whitewash on the bathroom walls and window frames too and since they are areas of moisture do they need a clear coat? What would you recommend?

A. Definitely for the wet areas, bathrooms etc. apply at least one coat of Resene Aquaclear but an additional coat may be applied to achieve uniformity of gloss.

December 2018

Q. Can I put the colour Resene Half Grey Friars on new preprimed bevel back weatherboard, or will it be too dark resulting in a line when the weatherboards move with the heat of the sun?

If this is the case, would Resene Quarter Grey Friars be suitable? Hopefully I can go with the first option.

A. Weatherboard suppliers place an LRV minimum of 45% on colour. The LRV of Resene Half Grey Friars is 14%, well below the cladding cut off value. We do have a Resene CoolColour™ version of the colour but this does not change the LRV. The CoolColour topcoat will not render the painted surface cool to touch but the CoolColour version will reflect more heat than the same colour made on non-cool technology. So while there is a reduced risk of board dimensional changes, it cannot be assumed to remove the risk. What we have found, is that if the boards are enveloped primed with a coat of Resene Quick Dry primer undercoat, the board shrinkage/expansion is reduced but not necessarily to zero.

December 2018

Q. I have sealed my hall with an interior waterbased product. Can I reseal over it with Resene pigmented sealer? You can still see stains behind it.

A. You could apply a coat of Resene StainLock then re-apply the top coats.

December 2018

Q. I have a 1930s house with wooden windows in a very exposed location. In rainy, windy weather, water seeps in around the edge of the glass of the windows. The exterior paint (acrylic) is generally in good condition (last painted seven years ago) but has peeled off the window putty, which is cracked in places. I assume the rain is being driven in through the cracks. I hope to solve the problem by repainting and want the paint to be durable and long lasting as many of the windows are on the second floor and require scaffolding. Suggested solutions from painters are: better prep (more sanding), applying No More Gaps and slightly overlapping the paint onto the glass, and using high-gloss oil-based paint.

A. Sorry but using a paintable filler and paint in my experience, will not correct the water ingress. You need to replace the putty.

December 2018

Q. I have water penetration in my house. I have dug out the earth in the area and the old seal paint has dried and flaked off. I do not intend to backfill the area, so whatever goes on the wall will be exposed to the elements. What is the best product to use to re-waterproof the wall?

A. As long as the paint system is not below ground level and water will not pond on the coated surface, you could use Resene X-200 (three coats) system applied over Resene Sureseal sealer.

Spot prime residual sound bitumen areas with Resene Membrane Primer and Resene Sureseal for bare concrete/block.

December 2018

Q. I had a professional painter repaint some of our indoor ceilings and walls with another ceiling white and mixed colours for the walls. The issue is, the ceiling (I think) has a continuing pungent odour ... it's not the paint smell, more like rotten egg gas. It is worse when the rooms heat up. I can only imagine it's the ceilings, but it could be the walls or woodwork (door trims, skirting etc.). I will have to repaint. Have you ever heard of this problem with another brand?

A. Lingering odours can often occur with new paint jobs but usually are gone after a week with good ventilation of the painted area. From what you describe, it is probably bacterial contamination of the paint that was used. Bacterial contamination can occur for many reasons, but is not usually found with freshly opened waterborne paint.

December 2018

Q. Have you got a suitable paint to go over MDF panel in a wet area?

A. MDF in wet areas can be an issue if there is water uptake by the MDF. The only way to address this is to apply an envelope seal coat of Resene Quick Dry and then a coat of Resene Enamel Undercoat and then topcoat the exposed face with Resene Room Velvet.

December 2018

Q. Can you buy a rimu additive for clear varnish?

A. Sorry but we do not sell tinted varnishes. But you can add Resene Colorwood Enhance to Resene Aquaclear which is akin to a tinted varnish. There are five Resene Colorwood Enhance colours - Jarrah, Walnut, Red Brown, White and Black.

December 2018

Q. Can I use the acrylic weathertight membrane Resene X-200 colour – Resene Truffle, on plain smooth wood sheets?

A. While Resene X-200 is designed for cementitious substrates it can be applied to appropriately primed timber.

December 2018

Q. We want to whitewash our original wooden flooring in a bathroom. The timber appears to be coated with a clear varnish. Can you please advise any tips and what specifics to use.

A: Degrease and sand to profile then apply a coat of Resene Colorwood Whitewash, then two coats of Resene Aquaclear.

December 2018

Q. I have some timber trellis which I have painted with Resene Quick Dry primer undercoat. What spray paint can I use over this primer?

A. We would not recommend applying a spray can paint; suggest you use Resene Lumbersider for the topcoat.

December 2018

Q. I carve Oamaru stone and sell it for outdoor placement. I want to either be able to coat it myself or give my customers advice on what they can coat it with, if they want to make it more water resistant.

A. Our only recommendation is to apply a saturation coat of Resene Solventborne Aquapel to render the stone water repellent.

We do not recommend application of a film forming system to the stone as the stone is cohesively weak and coatings peel from the substrate.

December 2018

Q. We have just had some Oamaru stone columns on our beach house at Waikanae rendered, as the soft Oamaru stone had suffered some wind damage/erosion. We now have a concrete looking render finish that we intend to paint in Resene Pearl Lusta which is the closest colour to the original Oamaru Stone we believe.

The renderer says to wait a week or two prior to painting. Is there a specific concrete or masonry paint we should be using other than the standard Resene Lumbersider or Resene X-200?

Do we need a masonry sealer or primer coat first? The renderer suggested we don’t need a primer as the rendered coating is only x 5mm thick.

A. For a plaster render we recommend a coat of Resene LimeLock followed by a waterborne topcoat. Given your location I would recommend 2-3 coats of Resene X-200. We cannot give any guarantees that the plaster overlay system will remain adherent to the underlying Oamaru stone as the stone has never been cohesively sound.

December 2018

Q. I have a tallboy I wish to paint. It is pine and stained yellowish. Would I need to sand it right back or is there another way to deal with it?

A. Degrease using Resene Interior Paintwork Cleaner paying particular attention to areas of hand contact. Sand to degloss/profile using 220 grit sandpaper dust off and apply a coat of Resene Quick Dry primer undercoat. Then finish with two coats of Resene Lustacryl.

December 2018

Q. Can I paint polycarbonate plastic conservatory roof panels? The paint will of course need to be long term (5 year)?

A. Any Resene exterior waterborne paint i.e. Resene Sonyx 101 will achieve very good adhesion to polycarbonate. Ensure two coats are applied and the polycarbonate is clean.

December 2018

Q. I recently spoke to technical person about a recent low sheen paint put in the bathroom. The bathroom wasn't used for two weeks after the paint was applied but has streaks down the walls now. I understand that the painter should have told us to wipe the walls down after the shower was used for the first time, and that the streaks are known as 'surfactant leaking' and that there is a Resene product that can help with the problem.

The painter has also offered to repaint, that being the case, is the best solution a matt, like we have now, or a semi-gloss?

A. This can occur with any waterborne paint if application and curing is at what the industry calls marginal conditions. Gloss level has no influence on the potential for surfactant leaching to occur. My suggestion would be to use Resene SpaceCote Low Sheen Kitchen & Bathroom.

December 2018

Q. I have a 10 year old building clad in Zincalume. There is some white corrosion on the upper parts where it doesn't get rain washed, and in places a small amount of red rust. I feel I need to paint it now to avoid further deterioration. I have Resene Galvo One primer - is this ok on the red rust?

A. The usual corrosion rate for a non-rain washed area is 2x that for a rain washed area.

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 Roof and Metal Wash diluted and used to label directions. 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 and all paint that is flaking or unsound must be removed by using mechanical methods e.g. 3M Rust and Paint Removal Disc, taking care not to damage either the substrate or the surrounding areas. The prep should leave only tightly adherent corrosion products.

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 the specified primer.

Then spot prime prepared areas showing corrosion with Resene ArmourZinc 110 and then apply a full coat of Resene Galvo One to the entire area and finish with two coats of Resene Sonyx 101. If choosing a dark coloured topcoat colour use the Resene CoolColour™ version of the colour if available. The Resene CoolColour topcoat will not render the painted surface cool to touch but the CoolColour version will reflect more heat than the same colour made on non-cool technology.

December 2018

Q. On our house we have the Resene Rockcote and paint system. Is Resene Paint Prep and Housewash ok to use around aluminium windows? On the bottle it says it may etch into metal and aluminium. We were given this product by the Resene rep to wash the house.

A. In the diluted state there is little or no risk unless the diluted wash solution is allowed to dry out on the surface.

December 2018

Q. I have doors to be painted, which are doors from the bathroom/toilet/laundry and lead into hallways. As the rooms are wet areas, do the doors need to be painted with oil based or can a waterbased paint be used? Also, what undercoat do I use? One side of the door would be wet area the other side would be ordinary. The doors look like they are preprimed and have a wood grain effect on panels.

A. Lightly sand, dust off then apply a coat of Resene Quick Dry primer and finish with two coats of Resene Lustacryl Kitchen & Bathroom.

December 2018

Q. Is it possible to reapply Resene Polythane on a substrate previously coated with Resene Polythane a few years ago, without complete removal of the old sound Resene Polythane coating?

A. Ensure the surface is degreased, then sand to profile/degloss. There is no need to completely strip.

December 2018

Q. Can you please tell me if the Resene Waterborne Woodsman range can be sprayed onto a dressed timber fence that has never been painted or stained? It is 18 months old.

A. Treat with Resene Moss & Mould Killer diluted and used to label directions. The stain can be applied by spray but you still need to apply the coats at the recommended spread rates. We do however recommend brush/roller application of the first coat.

December 2018

Q. I'm going to sand and paint varnished internal doors. After sanding, I will use Resene Waterborne Smooth Surface Sealer just in case. Should I undercoat over the top of that before applying topcoat? Also, is Resene Quick Dry undercoat ok?

A. Degrease using Resene Interior Paintwork Cleaner, paying particular attention to areas of hand contact. If you sand to de-gloss there should be no need to use the Resene Waterborne Smooth Surface Sealer, instead apply a coat of Resene Quick Dry.

December 2018

Q. We're about to have our house painted, and have chosen a Resene Black. How many coats would you recommend? It is white painted Hardiplank® and hasn't been painted for about 25 years. We will of course get the Resene CoolColour version to deflect some heat.

A. If the existing white paint is chalk free and sound, you can then apply two full coats of the new dark Resene CoolColour™. The CoolColour topcoat will not render the painted surface cool to touch but the CoolColour version will reflect more heat than the same colour made on non-cool technology.

When changing from a pale topcoat to a dark colour, there is always a risk that the dark colour will cause the existing paint to delaminate. Resene CoolColours reduce but do not eliminate this possibility.

December 2018

Q. We are considering using vertical cedar timber cladding on our new two storey house. What do you recommend that we coat it with? How many coats should we apply initially? What is the recoat frequency?

A. There is an increased risk of cupping/warping of the boards if installed vertically. For the best long term system, we recommend a solid colour system using Resene CoolColour™ topcoats. Apply the two coats of CoolColour paint over a solid white base coat/primer. The CoolColour topcoat will not render the painted surface cool to touch but the CoolColour version will reflect more heat than the same colour made on non-cool technology.

The CoolColour system will reduce but not eliminate the potential for dimensional changes. Envelope priming of the cladding pre-installation also aids with control of dimensional change.

December 2018

Q. What is a typical timeframe to repaint painted weatherboards? If we wanted to stain the house, what would be the maintenance interval?

A. The maintenance time for a stain is on average every third summer, solid paint system 8-9 years (to maintain aesthetics).
These timings will depend upon exposure conditions but the northern elevation is the most exposed elevation and this elevation is where the first signs of breakdown (chalking for a solid paint system) will be seen.

December 2018

Q. I am painting our bathroom and want to know apart from cleaning the mould off the ceiling with a bleach mix, how else should I prepare it before painting? The current colour has a slight shine to it.

A. After treating for mould infestation, apply a full coat of Resene Quick Dry and then finish with two coats of Resene SpaceCote Low Sheen Kitchen & Bathroom.

December 2018

Q. I want to paint over some ceramic tiles in our bathroom - standard white tiles with grout. Is the best option to use Resene Waterborne Smooth Surface Sealer then Resene Lustacryl? I am also painting our floor tiles using the Resene Uracryl 400 series (was advised to do that due to foot traffic).

Will Resene Waterborne Smooth Surface Sealer seal the grout as well?

A. 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. The sealer is not designed to be applied as a thick wet film thickness or give opacity, the thinner the coat the better. Then apply two coats of Resene SpaceCote Low Sheen or Resene Lustacryl.

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 and is not suitable for shower linings or floors.

Re floor tiles to be to be coated with a Resene Uracryl 400 Series topcoat, you will need to use Resene ConcreteSeal 3 in 1 as the adhesion primer first.

As to your question about grout: Resene Waterborne Smooth Surface Sealer is designed first and foremost as an adhesion primer but it will attain adhesion to grout.

December 2018

Q. We have shifted into a new home. It has around a 100 sq metre cobblestone concrete driveway, which has previously been painted but needs repainting. I have waterblasted it to get the dirt and any loose paint off. The cobblestones are fairly deep. I need to paint it the same colour as the veranda. It is a blue grey which I purchased from Resene. The driveway leads to a double garage.

What type of paint do I use? This is the 19th house I have painted, all with Resene and I would use no other as I am very satisfied.

The only traffic on the driveway is two cars getting in and out of a double garage and only twice a day. Not much really but enough for a bit of wear and tear. We turn off the main driveway into the entrance driveway, which is the cobblestone part. The house is 100 years old and the driveway is in concrete but in the form of cobblestones.

A. We do not have a dedicated waterborne paint for vehicular driveways, but we have had good success using Resene Non-Skid Deck & Path.

Spot prime bare concrete with Resene Sureseal then apply the two coats of Resene Non-Skid Deck & Path, you will need to leave the paint to dry without trafficking for at least five days.

December 2018

Q. I am about to start painting a 45 degree corrugated steel roof. It has been painted before, last time by spray painting with a waterbased paint. That would have been about 10 years ago. The deterioration is mainly that the coating is just wearing thin, with only a very few places where there is peeling. On the south side there is lichen infestation especially near the lower edge, and that is my main concern. I want to do a good job and will probably be spending a couple of years doing this in my spare time, moving a scaffolding frame progressively around the house, completing a section at a time.

I need to be able to deal with the lichen as completely as possible in one shot at each set up, although there is scope I suppose for spraying ahead with a wand/boom.

Is it feasible to spray 2% sodium hypochlorite and then in a fairly short timeframe, waterblast effectively?

My procedure then would be one coat of Resene Galvo One and two coats of one of the Resene CoolColour range acrylic roof paints.

A. You can spot treat the lichen with concentrated Resene Moss & Mould Killer but we still suggest waiting a couple of weeks before waterblasting, to allow for loosening of the lichen attachment.

December 2018

Q. I have laid some interior plywood floors, what is the best way to seal and protect them? We are situated at the beach so would like something that is hard wearing and water resistant.

A. Our best recommendation would be for three coats of Resene Polythane.

December 2018

Q. If I am patching cracks in my ceilings and walls should I just pigment seal over the patch or do I need to seal the whole ceiling/wall area before painting?

A. Just the repaired areas.

December 2018

Q. We are getting aluminium windows put into a concrete building. It is the usual practice for a run of sealant to cover any small gaps that may remain between the aluminium frame and the concrete building. The builder, who is doing our job, tells me he uses Bostik® MS Safe Seal. So what do we paint this sealant with? You have suggested Resene X-300E if I recall correctly. We have 60 windows, so want to get it right.

A. I have spoken with Bostik, and to follow is a summary of the discussion.

Around window frames is not as taxing as an expansion control joint but we would still recommend an elastomeric paint (Resene X-300E). Hundreds of houses are done with normal acrylic without complaints, but it is not worth the risk in a big job.

December 2018

Q. This is just a general question on what topcoat paint to use on a concrete building. I see that the Resene AquaShield data says that it breathes and allows water vapour to pass through it. How does this compare to the Resene X-200 properties? The point being, that sometimes you see on a concrete building that water has got in behind the paint and ‘bagged’, obviously because it can’t escape.

A. Resene AquaShield has the highest MVT (moisture vapour transmission value) of all our high build waterborne paints. Resene X-200 has crack bridging that Resene AquaShield does not.

Resene X-200 is by definition a weathertight film. Weathertightness is a state where liquid water is prevented from entering and accumulating behind the cladding in amounts that can cause dampness, or damage to the building elements.

December 2018

Always make sure you read the product label and data sheet prior to application. If in doubt about any aspect of your project, please ask our Technical Expert for help or come in and see our staff at your local Resene ColorShop or Reseller.

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