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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. What is the best paint for windows, doors and architraves on the interior and exterior? Would it be low sheen or flat? The interior is good condition enamel, about 20 years old. The exterior varies from good to poor condition and needs sanding, fill, and prime/undercoat.

A. Old enamel paint can be difficult to prepare to achieve adhesion of a new paint system. Ensure the existing enamel is clean and free from grease etc. then thoroughly sand to profile for recoating. Then apply a full coat of Resene Quick Dry primer undercoat and finish with two coats of Resene Lustacryl.

Dark colours may cause the rapid drying of damp timber with the ensuing danger of warping, though this effect will be lessened when a Resene CoolColour™ is selected in place of a standard colour. The CoolColour topcoat will not render the painted surface cool to touch but the Cool Colour version will reflect more heat than the same colour made on non-cool technology.

March 2019

Q. I am looking for a white paint suitable for applying to a textured fibreglass surface of approximately 15sqm that is part of a roof and open to all weather. Ideally we would like something which resists lichen growth as that has been a problem with the current paint. The finish can be anything from matt to gloss, but a semi-gloss or satin would probably be most aesthetically pleasing.

A. There are no additives that can be added to a paint to control lichen growth on a painted surface. The easiest way is to spray the roof with Resene Deep Clean diluted and used to label instructions at the beginning of spring and autumn and then leave nature to do the hard work.

March 2019

Q. I'm presently cleaning down (waterblasting) three concrete water tanks on our local Golf Course. They have cracks that are seeping but these will be sealed. Two of them have previously been painted and the other is bare concrete. I have recently finished painting my house with Resene X-200 and question if that could be used on the tanks as it is user friendly paint. I realise the 'bare tank' will require to be sealed first or maybe not if using Resene X-200.

A. Yes if the leaks are fixed, prime bare concrete with Resene Sureseal then apply three coats of Resene X-200. If there are signs of bio growth, mould/algae, then treat these areas with Resene Moss & Mould Killer diluted and used to label directions.

The Resene X-200 system will give a durable decorative paint system.

March 2019

Q. How do I paint a metal front door in a sea spray zone? I think its powder coated at the moment and is in good condition - no pitting, paint peeling or rust - just not a very nice colour.

I have painted my tin garage roof and walls with a spray gun and Resene Hi-Glo paint but the door isn't at my house, it's at a friend's house and she's concerned the sea spray would affect a painted door.

A. Wash down using Resene Roof and Metal Wash diluted and used to label directions, lightly sand with 400 grade sandpaper to profile the powder coated surface. Apply two coats of Resene Galvo-Prime and finish with two coats of Resene Lustacryl.

We recommend the Resene CoolColour™ version of the Resene Hi-Glo be used if selecting a dark 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.

March 2019

Q. I have some rust spots (staining) coming through a painted handrail. I would like to paint over the handrail with the same colour as our house is painted. How should I treat the rust?

A. We don't recommend 'painting‘ over rust spots as this does not address the cause.

Typical preparation for this situation is as follows; 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.

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.

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.

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 the specified primer.

March 2019

Q. I require a black tinter to add to creosote.

A. Creosote should penetrate into the timber substrate, if you add bulk colorant this will not be absorbed to any extent and has the potential to remain on the surface and weather away relatively quickly, so the original blackness intensity may disappear relatively quickly, especially on the northern elevation.

March 2019

Q. I need paint to waterproof the concrete pavement and concrete brick wall of my carport, so water doesn't seep through into the carport when it rains.

A. The best way to fix this is to make the exterior face of the blockwork weathertight by applying our Resene X-200 system, however if the exterior wall is back filled then this is not possible.

We have no system to waterproof the pavement but Resene HydraBlock may be applied to the interior face if access to the exterior face is not possible.

March 2019

Q. Can Resitex be applied over mill finish aluminium cladding?

A. Yes as long as the aluminium is primed with Resene Galvo One.

March 2019

Q. We are putting in a macro cooktop bench top inside and want to know what you recommend to seal it with.

A. For a clear coat system to achieve a water resistant clear finish, use four coats of Resene Polythane, and envelope seal with at least two coats.

March 2019

Q. I am a do-it-yourself home owner. I am not a novice painter and have had good results in the past.

I am painting the ceiling of my living room/dining room. The area is 9.5m x 5m. The long wall is north facing, with floor to ceiling windows supplying a lot of light. It has been undercoated twice with Resene Broadwall sealer and covered with Resene ceiling paint. I have used a roller and the correct sleeve. I had no trouble with the undercoats. However, with the topcoat, most of the joins are obvious in certain light. There is also a slight roughness to texture of the paint at the joins. I have recoated, but the joins are still obvious. Because of same colour on same colour and the glare, I found it quite difficult to see as I painted the topcoat. I enquired if the heat is a factor and if drying the paint before returning to paint the next segment and work it into the previous segment, or I am not using enough paint, or I am doing something else wrong.

A.    What you are battling is critical lighting.

The issue with joints is probably is a result of sanding of the stopped joints, resulting in furring of the paper face at the paper/stopping overlap. Suggest using a fine sandpaper grade to denib the areas showing the defects then apply 1 or 2 coats of Resene Broadwall Surface Prep and Seal to the affected areas (maybe best to coat the entire ceiling) then finish with two coats of Resene SpaceCote Flat.

March 2019

Q. How much more paper will I need to hang a horizontal striped paper diagonally?

A. We generally recommend allowing about 20% extra wallpaper.

April 2019

Q. I have chemically stripped a 44 year old hot dipped galvanised handle rail with round balusters. It was previously coated with oil based primer, undercoat and high gloss house paint. The surface is now right back to the aged zinc which is in good condition without rust. This is something I don't want to prep and repaint for a long time! Clearly my preference is not to have to deal with two pack products but will do if I really have to. I have used Resene Enamacryl for topcoats on wooden doors in the same area. These have survived really well. What are my options please?

A. Nice job on stripping back the old coatings. Two pack products are always the most durable, however if your preference is not to use two pack, and you've had good success with Resene Enamacryl, then the system below will give you good durability and be easy to touch up over time also.

May 2019

Q. In the past 20 years we have painted our wooden Fraemohs house three times with an oil-based Resene wood stain (colour light oak). I have just mistakenly bought 10 litres of the water-based version of this stain. Can I apply this on top of the oil-based stain? What preparation do I need to do? It's too large an area to sand and I'm worried about 'peeling'. I've been very happy with the 20 year results of the oil-based stain and wonder whether I have wasted my money and should just go back to buy the oil-based one, although my budget really would make that difficult.

A. Applying the waterborne version of Resene Woodsman over the oil based version is fine and you will achieve a good finish. A normal clean down with Resene Paint Prep and Housewash prior to staining is all that's required prior to applying the new stain. Take care not to apply too much as staining is better applied in thinner coats.

May 2019

Q. What paint do I use to seal external new fibrolite please?

A. The recommended Resene primer for new exterior fibre cement is Resene Concrete Primer.

May 2019

Q. I'm looking for paint that gives a concrete colour and texture. The substrate is an in situ concrete wall, but it has been skimmed, filled and repaired in areas giving it a patchy look. I'd like to find paint that I can use that still looks like concrete, but will give me a much more uniform finish.

The wall is in a basement car park, so while not exposed directly to weather, it probably needs to be considered external.

A. We recommend Resene Sandtex tinted to Resene Quarter Delta.

May 2019

Q. I bought deep grey Resene Concrete Stain and have tried two coats but it is a bit dark and uneven. I am applying it on the concrete block walls in the garage. The walls are in good condition but from the 1960s and there is an area that has some oil. What should I use to prepare this area? Can you apply just one coat or do you need a clear coat and does it need restaining every year?

A. It is not easy to achieve a uniform colour when applying Resene Concrete Stain to a vertical surface, as the product viscosity is designed for application to a horizontal surface. The solvents in the stain can re dissolve the oil which may well change the appearance when the stain is applied over an area contaminated with oil.

There is no way that the oil staining can be stabilised or disguised when staining.

May 2019

Q. I want a polished concrete 'look' for the walls and floors in my bathroom. Do you have such a product?

A. The polished look is achieved by diamond grinding/polishing of the concrete and then application of a clear coating.  For the clear finish we recommend Resene Concrete Wax.

May 2019

Q. I have small sleepout which is 5x8m and was built in 2000 with Shadowclad® that has never been stained or painted. What do I use to protect the cladding which is still in good condition? I live 50 metres from the sea. It has certainly greyed and I had it chemically washed 4 months ago. The bottom baseboards which I closed in under the dwelling, need another scrub, but it's the Shadowclad® I really want to paint or stain as I am not young and want whatever I do to see me out.

A. Ensure the surfaces are free of mould and then apply a coat of Resene TimberLock, wipe excess at time of application and leave to cure for at least 48 hours then apply a full coat of Resene Wood Primer. Then apply two coats of Resene Sonyx 101 semi-gloss or Resene Lumbersider (low sheen). If selecting a dark colour, use the Resene CoolColour™ version of the 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. Dark colours may cause the rapid drying of damp timber with the ensuing danger of warping, though this effect will be lessened when a CoolColour is selected in place of a standard colour.

Staining will be a high maintenance option; you may have to re-stain every couple of years. The system given is our best shot at a long term coating system.

May 2019

Q. Which Resene Paint product is best suited for a high-traffic concrete floor, in an entrance way that is partially exposed to the weather?

A. Resene Non-Skid Deck & Path.

May 2019

Q. I have a house that is covered in dust from the driveway, which wasn't gravelled immediately after construction. The dusty cedar cladding stain is light coloured. Is Resene Paint Prep and Housewash ok to clean this with?

A. You can use Resene Paint Prep and Housewash to try and remove the dust, however we cannot say that it will be effective and if the dust contamination has occurred while the stain was fresh, then it may have become attached/embedded to the stain and difficult to remove.

May 2019

Q. I have used an alkyd exterior wood primer on an exterior pergola on areas where I have needed to sand down to the timber surface. The remainder of the pergola is painted in waterborne paint. Can I use the waterborne paint over the primer once dried?

A. Resene Wood Primer can be over coated with Resene waterborne topcoats.

May 2019

Q. I'm wondering how to paint the Hardiplank® exterior of our house. It was built in the 1970s and was repainted about 5-10 years ago. The paint is in good condition but I don't like the colour. I would like to use Resene Sea Fog but I'm unsure exactly which Resene paint to use on Hardiplank®.

A. Wash down using Resene Paint Prep and Housewash diluted and used to label directions, apply a full coat of Resene Quick Dry then two coats of Resene Sonyx 101 tinted to the required colour.

May 2019

Q. Can you paint a house clad with Hinuera Stone, and if so, what is the process and what colour would you recommend to make it look trendy?

A. Resene does not recommend painting Hinuera stone claddings. The stone is cohesively weak and while painting can be achieved, the paint film will, more than likely peel from the surface at a later date.

May 2019

Q. I have some timber steps leading up to a balcony, which were painted many years ago; there is no apparent rot but the paint has flaked significantly. I intend to remove algae, sand and apply Resene TimberLock. I was thinking of applying Resene Quick Dry and then a bitumen waterproof membrane. Then I'd apply Resene Membrane Primer followed by Resene Sonyx 101.

Firstly, do you think a bitumen membrane is overkill? Would Resene TimberLock and using a solventborne wood primer be adequate? Water does pond on the steps when it rains.

Secondly, I noticed that Resene TimberLock has dibutyl phthalate in it from the SDS. Is this plasticiser going to cause problems with applied to waterborne coatings and the bitumen membrane?

A. What is the timber? Bituminous membranes can be but are not usually applied to timber substrates. Treat mould/algae with Resene Moss & Mould Killer diluted and used to label directions.

Wipe excess Resene TimberLock at time of application and leave to cure for at least 48 hours before applying a full coat of Resene Wood Primer. Then finish with two coats of Resene Walk-on.

May 2019

Q. I have some unopened Resene Lumbersider paint, 18 years old, stored for painting a rental property. It's time to finally paint it so will the paint be okay?

A. Not a common situation I must say. The paint technology that we were using when the paint was originally made has now been upgraded to achieve improved exterior durability. Suggest that you take the pail to a Resene ColorShop and ask them to put the pail on the store shaker.

Open the can and if it is homogeneous and contains no bits, or if the paint smells off (unwashed sports socks odour) then the paint would not be suitable for use.

May 2019

Q. Could you advise about how to remove a few dried spatters of Resene Sureseal pigmented sealer from light switches and other fittings?  The walls and ceiling were prepped only about two weeks ago.

A. Our only suggestion would be careful use of Resene Graffiti Cleaner. We cannot give any undertaking that the use of the product will not affect the substrate.

May 2019

Q. l want to paint my plasterclad house, what type of paint do you recommend? Which one is better Resene Sonyx 101 or Resene X-200?

A. As long as there are no weathertight issues, and the paint system is sound, then I would recommend two coats of Resene X-200. Prepare the surfaces by a wash down using Resene Paint Prep and Housewash diluted and used to label directions.

If there are any areas showing mould/algae infestation, treat these with Resene Moss & Mould Killer diluted and used to label directions then Resene Paint Prep and Housewash also diluted and used to label directions.

May 2019

Q. We are repainting our weatherboard home, which is in an extremely rough condition. We have used a paint shaver and a sander to remove the paint and then undercoated, filled, sanded, re-undercoated and painted in Resene Double White Pointer for the main part. Resene Black White for used for the windows, both in semi-gloss. We have noticed that every little imperfection shows up in the weatherboard no matter how much we fill and sand. Is there a better undercoat that you could recommend to stop grain raising? Also, is it normal to have a not perfectly flat surface on repainted weatherboard homes?

A. Not sure what undercoat/topcoat system you have used but on average two coats of a standard paint will only give a thickness that is akin to a piece of cello tape, so will not fill to any real degree but will telegraph the base to which it has been applied.

Repairs to a multi-layered paint system where there has been removal of a section of the old paint, can be difficult to repair to a flush finish and close up or at side angles the substrate defects will be visible.

Resene Timber Surface Prep can be used to repair the surface for a flush finish.

May 2019

Q. A contractor undertaking water blasting/sealing work at a neighbouring property has left drops and splodges on a car, asphalt driveway and painted steel roof on our adjoining property. Can you advise the process and complexity of removing Resene Waterborne Aquapel and what sort of damage might be expected to paint etc?

A. Resene Waterborne Aquapel is not paint but a water repellent treatment for concrete. The only way that we are aware of, is to wipe the surface with eucalyptus oil.

May 2019

Q. I've been told by my painter that the Resene Colorwood Whitewash that I want to use on my existing floorboards cannot be guaranteed not to yellow. Can you tell me if this is the case, and if so what causes it to yellow?

A. Not sure where your painter got his info from but the resin system used to make the product is a non-yellowing waterborne resin.

May 2019

Q. How do I prevent moisture penetrating a block wall, also through cement board? Would two coats of Resene Hi-Glo waterborne gloss be adequate?

A. Blockwork can be rendered weathertight by application of the Resene X-200 system to the exterior face of the blockwork. All pointing must be sound and flashings functioning as designed. Low build waterborne paint systems such as Resene Hi-Glo will not give weathertightness.

With fibre cement cementing the jointing system must be sound as jointing failure is where most water ingress issues arise from. A primer, Resene Concrete Primer and two coats of Resene Hi-Glo should render the FC weathertight.

The definition of a weathertight system is a paint system that does not allow liquid water to pass through the paint system but allows water vapour to pass both ways.

May 2019

Q. I am painting two new external fibreglass doors. I will be finishing with Resene Lustacryl. Do I need to use an etch primer or will your Resene Quick Dry waterborne primer be okay?  I don't want to be repainting in a few years.

A. Degrease using Resene Roof and Metal Wash diluted and used to label directions and then sand using 380 grit sandpaper, dust off and apply a coat of Resene Quick Dry followed by the two coats of Resene Lustacryl. Use the Resene CoolColour™ version of the topcoat colour if selecting a dark 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.

May 2019

Q. Can I paint ceramic splashback tiles in a kitchen successfully? They are large tiles 15cm x 15 cm and currently navy blue.  

A. If you can maintain hand contact on the tiled area when the elements close to the tiles are at full heat, then yes.

May 2019

Q. We have been asked to find a colour in your epoxy two pot range. We are having a steel pole galvanised then it is to be treated with your epoxy. Is there a choice of colours?

A. Resene Armourcote 510 high build epoxy can be tinted to a range of Resene colours, however we do not recommend epoxy coatings be left exposed to direct weathering as the epoxy coating will undergo surface chalking. To address this, we always recommend topcoating the epoxy with Resene Uracryl 400 Series topcoats.

May 2019

Q. What is the best paint for a garage floor?

A. Resene Aquapoxy is excellent for concrete garage floors, however the most important part of coating a garage floor is the preparation.

This almost always requires the concrete surface to undergo diamond grinding to remove surface contamination and provide a key for the new coating. If not prepared properly there will be problems with ‘hot tyre pick up', which is where you drive in and park your car and the hot tyres lift the coating from the surface. This is very common if floors aren't prepared correctly.

May 2019

Q. I used Resene X-200 for the original coat of paint on my plaster on brick house 10 years ago. The original paint is still in good condition. Do I use X-200 again or a different topcoat?

A. If all in good condition then yes, Resene X-200 would be ideal again. Ensure you clean down suitably prior to painting.

May 2019

Q. We are building a house with an internal concrete slab that will eventually be polished up for the kitchen/living area. Is there something that we can use to protect it from spills etc in the short term that won't make it difficult to grind at a later date?

A. A couple of coats of Resene Concrete Wax is probably the best option here as it's easy to apply. While the data sheet says to thin the first coat it may be best to apply it unthinned so it doesn't penetrate the surface too much.

Given that the floor won't be prepared prior to application, we can't give any guarantees on how long it will last and you may need to touch up in high traffic areas (easy to do this). Make sure the floor is dust free prior to applying.

May 2019

Q. I am looking at staining my new deck that was added on to an existing deck. The current deck is stained a darker, redder colour - we are looking at staining the entire deck including the already stained deck, a lighter colour. Any ideas on how we may go about this?

A. It's difficult to match old and new timber, particularly when the older area has a much darker/redder stain on it. You won't be able to just stain over to achieve this.

You may want to trial an area to see if you can remove the existing stain by scrubbing with Resene Timber and Deck Wash. It can often remove excess stain from a surface. If successful, you'll get a much more even appearance when you re-stain.

May 2019

Q. I am looking for a paint system that will adhere to commercial grade lino; it is for toilets in a town hall of moderate use.

A. Painting old lino can be a challenge and for commercial type situations, I would advise that you may end up needing to touch up or repaint the floor regularly as we can't guarantee adhesion of a paint system over old lino.

The best system we have is to apply a seal coat of Resene Waterborne Smooth Surface Sealer and leave to cure for 48 hours then apply two coats of Resene Walk-on followed by a seal coat of Resene Concrete Wax.

We'd suggest a test patch is done to confirm adhesion of the Resene Waterborne Smooth Surface Sealer. Ensure the lino is washed down using Resene Paint Prep and Housewash diluted and used to label directions before priming.

May 2019

Q. What is the best way to get an even flow with deck and path paint?

A. If rolling out, you'll want to ensure you work in a methodical and uniform manner (typically along the entire length of a board or two if painting a deck) ensuring you keep a wet edge on the paint you have just applied while you roll the next areas so they blend in. You should ensure also, that you aren't painting in direct sunlight as this will have the paint dry extremely quickly and show roller/brush marks.

Ensure you are using a No.1 Roller sleeve (8mm Dacron) if rolling.

May 2019

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.

Page 30
 
 

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