Refer to the below information, in conjunction with label instructions, to guide you in your product selection when painting over weather affected exterior surfaces.
Advice for painting affected 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.
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); wear rubber gloves and eye protection. Power washing is also an option. Rinse timber. Dulux recommends repainting with Dulux Weathershield.
Is the surface peeling or flaking?
Prepare surface by removing all loose paint with scraper or wire brush, sand rough surfaces, prime bare timber. Dulux recommends using Dulux Weathershield when repainting.
Is the surface blistering?
If blisters go down to the substrate, first try to remove the source of moisture. Remove blisters by scraping, then sanding the surface. Dulux recommends Dulux Weathershield when repainting.
Advice for painting new surfaces
Painting new exterior timber surfaces
Fill nail holes with a flexible, exterior wood filler. Sand all dressed timber. Dulux recommends using Dulux Weathershield.
Painting exterior brick, masonry, fibre cement surfaces
Unpainted masonry should be cured for at least 28 days before painting. Ensure surface is sound by conducting an adhesion test and clear of any loose sand or cement. Fill holes with grouting cement. Wash down with water using a stiff brush to remove all loose material. To remove efflorescence see can for details. Dulux recommends using Dulux Weathershield.
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For more information please contact Dulux Customer Service or 0800 800 424