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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

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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