Can you paint over mold?
No. Painting over mould hides it without killing it, and it grows back through the new coat. Paint is not a treatment, and "mould-resistant" paint is formulated to resist new growth on a clean surface, not to cover existing growth. Use a stain-blocking primer.
Short version
- No.
- Prepare it: find and fix the moisture source first, then remove the mould and let the surface dry completely.
- Prime with a stain-blocking primer.
- Most common failure: mould reappearing through the new paint within weeks, and hidden damage spreading behind an intact-looking wall.
How to prepare the surface
Find and fix the moisture source first, then remove the mould and let the surface dry completely.
Then prime with a stain-blocking primer. Priming is not optional on this substrate — it is the step that decides whether the finish is still attached in two years.
What to watch out for
Mould on drywall usually means water is getting in. Painting it without fixing that guarantees the problem returns, and the drywall may need replacing rather than cleaning.
How this job usually fails
Mould reappearing through the new paint within weeks, and hidden damage spreading behind an intact-looking wall.
Common mistakes
- Skipping the primer because the existing surface "looks fine" — adhesion is decided by the substrate, not by appearance.
- Recoating on "dry to touch" rather than the recoat time on the product's data sheet.
- Using wall paint on a surface that gets handled or walked on.
- Painting in direct sun or on a hot surface, which stops the film levelling.
Sources
- Sherwin-Williams. Product technical data sheets (accessed 2026-08-17).
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