How To Paint Over Mould

This guide explains how to paint over mould and mildew stains and prevent them from returning, while achieving a decorative finish.

Surface Preparation

  • Make sure all surfaces are clean, dry and free of anything that may prevent adhesion.
  • Remove any loose or unstable material by scraping or brushing with a stiff brush until the edge is sound. Then feather the edges with fine grade abrasive paper.
  • Remove all visible signs of organic growth. Then treat the whole area (there may be further invisible growth) with Zinsser Mould Killer. Ensure to follow the instructions, and allow to dry completely.
  • Where paint is still sound, clean surfaces with Zinsser Universal Cleaner and Degreaser to remove any impurities, then rinse thoroughly with clean water, and allow to dry.
  • Fill any cracks and small surface defects with a suitable filler according to manufacturer’s instructions, allow to dry, then rub down with a fine grade abrasive paper and clear any dust from the area.


Prime all areas – bare, stained and filled – with a single coat of B-I-N Primer Sealer, following manufacturer’s instructions. Allow to dry for at least 45 minutes.


Paint with two coats of Perma-White Interior Matt, Satin or Semi-Gloss following manufacturer’s instructions, allowing a minimum of two hours’ drying time between coats.

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