Mould Resistant Paint

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The best solution to mould is to prevent it. Mould resistant paint is a good second line strategy. It is possible to buy mould resistant paint, but it is also easy enough to make the paint you already have mould resistant.

These work with both water and oil based paints.


  • Finely crush 16 aspirin tablets, it must be completely powdered, mix into 2.5 litres of paint. Let it stand 5 minutes then mix again.
    • The salicylate will react with water to form salicylic acid.
  • Add a pinch of copper compound to a can of paint, and mix in. Some copper compounds are toxic if ingested in more than miniscule amounts, so wash hands afterwards.
    • If the copper compound is not soluble in the paint base then it must be finely powdered before adding.
  • Add a pinch of alum to a can of paint and mix. For oil paints the alum must be finely powdered.
  • Combine more than one additives for maximum mould resistance.