Can you paint over mould? (Why it never works)
No: paint hides mould, it doesn't stop it
You can paint over mould, but it won't last. The growth is still on the wall under the new coat, and the damp that fed it hasn't gone anywhere, so the mould carries on and shows through the paint again, sometimes within weeks. The fix is to deal with the moisture and remove the mould first, then paint.
It's an understandable shortcut. A fresh coat is quick, cheap and makes a room look cared for. It just treats the symptom you can see and leaves the cause exactly where it was.
What happens under the new coat
Paint forms a film over the wall. If the plaster behind it is damp, that moisture has to go somewhere, and the paint starts to lose its grip: it bubbles, blisters and peels, and dark specks creep through at the edges. Mould left underneath keeps feeding on the damp, and each new coat adds another layer for it to hide behind.
Stain-blocking primers can hold back the discolouration for a while longer, but blocking a stain is not the same as clearing growth. The wall looks better while the problem stays put.
The Cyprus repaint cycle
It's an easy loop to fall into here. Through winter the house is closed up, condensation gathers in cold corners and behind wardrobes, and black spots appear. By late spring the walls have dried, the mould looks dormant, and someone repaints. When the cold weather comes back, so does the mould, often in the same outline. Why mould grows in winter explains the conditions behind that.
The same temptation comes up before a flat is let or a holiday home goes on the market. A fresh coat may look fine for a viewing, but mould that returns weeks later leads to awkward conversations; mould in rented, holiday and for-sale homes covers that side.
Doing it in the right order
- Find the moisture source. Condensation, a leak, rising damp and penetrating damp all need different fixes; telling the three types of damp apart is the first job.
- Fix it. Better ventilation, a repaired pipe, a sealed crack or a warmer wall, depending on the cause.
- Clean off surface growth. Ventilate, wear gloves and a mask, and wipe with a damp cloth and a mould cleaner rather than brushing it dry. Don't mix cleaning products. Removing mould from walls goes through this step.
- Strip what's damaged. Mouldy wallpaper, flaking paint and soft plaster won't hold a new finish.
- Let the wall dry fully. This can take longer than you expect, especially on an outside wall in cool weather.
- Then repaint, using an anti-mould paint as the finish.
Where anti-mould paint fits
Anti-mould paint helps a clean, dry wall resist new growth. It's a finish, not a treatment: brushed over live mould on a damp wall, it fails like any other paint. Finishing in an anti-mould coating is one of the typical fixes in a report, but it comes after the cause has been dealt with, not instead of it.
When the wall needs more than paint
If the plaster crumbles when you press it, the mould has already come back through one repaint, or the wall feels cold and damp to the touch, it needs more than decorating. The moisture source gets found first, and only then is the mould dealt with, which is why the fix holds. Moisture readings on the wall before you pick up a roller tell you whether it's ready, with a written report and the quote. If it isn't, removal that repairs the cause before the wall is refinished clears the growth, repairs the cause and finishes the surface in an anti-mould system, from €175.
About to paint over a damp wall? Check it first — book an inspection from €75 or call +357 99 759144.