The products you will need to use depend on whether you are painting over weathered surfaces or painting new surfaces. Use the below information in conjunction with label instructions to guide you in your product selection.
Advice for painting weathered surfaces
Determine if the surface is sound
- Conduct an adhesion test on all previously painted surfaces. Ensure surface is sound by cutting a small X through the existing paint with a sharp blade, press cellulose tape firmly across the cut and then rip off the tape. If the paint comes off, it is unsound and should be removed.
- Repeat at random in a number of areas to test the surface.
- Scrape off all loose and flaking paint and ensure the surface is dry.
- If you are unsure, we recommend that you contact your local qualified tradesperson.
Does the surface exhibit mould?
- Remove all mould and mildew from the surface by scrubbing with a diluted household bleach solution (one part bleach, three parts water). Make sure you are wearing rubber gloves and eye protection. Power washing is also an option.
- Rinse any timber.
- We recommend you use Dulux Weathershield® for your top coat.
Is the surface peeling or flaking?
- Prepare surface by removing all loose paint with scraper or wire brush.
- Make sure you sand any rough surfaces.
- Prime bare timber before applying Dulux Weathershield®.
Is the surface blistering?
- If blisters go down to the substrate, first try to remove the source of moisture.
- Remove any blisters by scraping, then sanding the surface.
Advice for painting new surfaces
Painting new exterior timber surfaces
- For timber surfaces, fill nail holes with a flexible, exterior wood-filler.
- Sand all dressed timber.
Painting Exterior Brick, Masonry or Fibro Cement Surfaces
- Unpainted masonry should be cured for 28 days before painting.
- Ensure surface is sound by conducting an adhesion test and clear off any loose sand or cement.
- Fill holes with grouting cement.
- Wash down with water using a stiff brush to remove all loose material.
- Refer to the can labels for details on how to remove efflorescence.
More how to guides
When your weatherboards are looking a little weathered it's time to give them the Dulux treatment. Tested for over 40 years in New Zealand conditions, Dulux Weathershield is designed to withstand all weather conditions.
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