Why Painting Over Mould Never Works (Even with “Mould-Resistant” Paint)

It’s tempting. A fresh coat of paint and the mould disappears. Except it doesn’t — it just goes into hiding. Painting over mould is one of the most common mistakes Adelaide homeowners make, and it always ends badly.

What Happens When You Paint Over Mould

The mould is still alive under the paint. Its root system continues growing through the plasterboard or timber, feeding on moisture. Within weeks to months, the mould pushes through the paint film — often worse than before because the paint trapped moisture inside the material.

“Mould-Resistant” Paint Isn’t a Solution

Anti-mould paints contain fungicides that resist new mould colonisation on the paint surface. They don’t kill existing mould underneath. Using mould-resistant paint over untreated mould is like putting a waterproof bandage on an infected wound — it seals in the problem.

The Correct Sequence

1. Identify and fix the moisture source (condensation, rising damp, leaks)
2. Remove contaminated materials (often requires cutting out affected plasterboard)
3. Treat with anti-microbial solution
4. Allow to dry completely
5. THEN repaint with mould-resistant paint on clean, dry surfaces

If you’ve been painting over mould and it keeps returning, it’s time for professional assessment. Get matched with qualified Adelaide specialists.