Water-stained walls can bleed back through topcoats if the surface isn’t properly prepared and primed – follow our 3-step guide below to paint over exterior water stains with water-based Zinsser products.
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Businesses and landlords with water-stained walls will want to get the job completed without having to revisit it to treat bleed-through – the quicker scaffolding goes up and comes back down again will prevent disruption to business – ruining the image of a property and affecting its attractiveness towards customers and potential tenants alike.
How to stop water stains from bleeding through paint? When treating exterior water stained walls, you’ll need a paint that will keep stains at bay – Bulls Eye 1-2-3 is an unrivalled water-based primer, sealer and stain killer ideally suited to the job.
Zinsser listens to contactors and develops new products – or adds features to existing products – to meet their changing needs, delivering world class products that meet “real world” challenges, providing tried and tested solutions to painting problems, such as painting over exterior water stains.
Step 1. Surface Preparation
Ensure the surface is dry and clean, free of anything that could interfere with or affect the adhesion of coatings and materials to be applied.
Loose and failing materials can be removed by scraping or brushing with a stiff-bristled brush to a sound edge, then feathering with a fine-grade abrasive paper and removing all dust.
Prior to painting, the moisture content should not exceed 12%.
Remove all visible signs of organic growth, treating the affected areas with Zinsser Mould Killer & Remover (in accordance with the manufacturer’s instructions) and allow the surface to dry.
Wash the surface down with hot water and liquid detergent solution to remove any contaminants, frequently changing the water, and then rinse thoroughly with clean water to remove all residues before allowing to dry.
Use a suitable filler, in accordance with the manufacturer’s instructions, to fill any cracks and small surface defects and allow to dry before rubbing down with a fine grade abrasive paper, removing all dust.
Using one coat of Zinsser Bulls Eye 1-2-3, patch prime all bare and filled areas in accordance with the manufacturer’s instructions and allow a minimum of 2 hours (in normal conditions) to dry.
Step 2. Priming
All water stained areas can now be primed with one full coat of Zinsser Bulls Eye 1-2-3, using a second coat if excessive absorption occurs, and allow the primer to dry overnight before decorating with a topcoat.
Step 3. Decoration
Now the previously-stained surface has bene suitably prepared and primed it can be decorated with two full coats of Zinsser AllCoat Exterior Satin/Gloss, in accordance with the manufacturer’s instructions, with a minimum drying time of one hour between coats.