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Home > How To > How to paint exterior mildew areas

How to paint exterior mildew areas

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A common problem when painting over exterior mildew areas is bleed through – the solution is Zinsser AllCoat®.

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Steps

1. Surface preparation

All surfaces must be clean, dry and free from anything that will interfere with the adhesion of the materials to be applied. Remove loose and failing material by scraping or brushing with a stiff bristle brush to a sound edge. Feather sound edges with a fine grade abrasive paper. Remove all visible signs of organic growth and treat the areas with Zinsser Mould Killer in accordance with the manufacturer’s instructions. Allow to dry. In areas with remaining sound paint clean down with Zinsser Universal Cleaner & Degreaser to remove any contaminants. Rinse thoroughly with clean water to remove all residues. Allow to dry. Fill any cracks and small surface defects with a suitable filler in accordance with the manufacturer’s instructions. Allow to dry. Rub down with a fine grade abrasive paper. Remove all dust.

2. Priming

Prime all stained, bare and filled areas with one coat of Cover Stain® Primer Sealer in accordance with the manufacturer’s instructions. Allow a minimum drying time of two hours in normal drying conditions.

3. Decoration

Decorate with two full coats of AllCoat® Exterior Satin or Gloss in accordance with the manufacturer’s instructions. Allow a minimum drying time of one hour between coats.

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