Anti-mould paint contains a fungicide that resists spore growth on the painted surface itself. It is a genuinely useful product on cold bathroom walls and north-facing bedrooms, but it will not solve a ventilation or damp problem underneath it.
It slows regrowth on the painted surface but cannot fix poor ventilation or damp behind the wall. Where those causes remain, mould will eventually reappear.
No. We wash it off and treat the surface first — painting over active mould traps it and often makes it reappear through the new coat within months.
It is most useful in bathrooms, kitchens and cold external-wall bedrooms, but any consistently damp or poorly ventilated room can benefit.
The fungicide slows regrowth on the paint film, which buys time and keeps a surface presentable between cleans. It does nothing about the moisture load in the room, so a bathroom with no extraction will still generate condensation that finds the next cold surface.
Painting an anti-mould coat straight over active black spotting simply seals spores under a new film. We wash affected areas down, treat and let them dry properly before any coating goes on, so the new system starts clean.
On a well-ventilated bathroom ceiling it extends the interval between repaints noticeably. On a room with a known damp source it is a short-term measure at best, and we say so rather than sell a coating as a fix for a building fault.
Send us photos of the affected wall and we will explain whether a coating alone will help.
Anti-mould paint slows regrowth on a clean, prepared surface, but it is not a substitute for fixing damp or ventilation.
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