Anti Condensation Paint vs Anti Mould Paint: What's the Difference?

Anti condensation paint and anti mould paint solve two different halves of the same problem, and the labels get used so loosely that plenty of people buy the wrong one. One manages the moisture; the other stops the mould. As a UK manufacturer — Legacy™ Anti Mould Paint is made and batch-tested at our East Kilbride factory — here's the plain-English version of what each type does, and how to pick.

What does anti condensation paint do?

Condensation forms when warm, moist air meets a surface cold enough to push it past its dew point — the streaming window on a winter morning, or the clammy external wall behind a wardrobe. Anti condensation paints attack the "cold surface" part. They're thick coatings, often filled with tiny insulating spheres, that slightly warm the surface temperature of the wall face and absorb some moisture during humidity spikes, releasing it as the room dries. Result: less visible wetness on the painted surface.

What they generally don't do is stop mould biologically. Reduce condensation enough and mould gets less to drink, sure — but in a genuinely damp room the surface still spends hours above the humidity mould needs, and a coating with no fungicide can still grow spots.

What does anti mould paint do?

Anti mould paint attacks the biology instead of the physics. Legacy is a solvent-free acrylic emulsion carrying an in-film fungicide: condensation may still form in a steamy bathroom, but spores landing on the film can't germinate, so black spot mould (Aspergillus niger — the classic UK bathroom mould) never establishes. The surface wipes clean with warm water and keeps its protection, and the finish is a normal-looking matt white rather than a thick textured coating.

Its honest limitation is the mirror image: it doesn't warm the wall or stop droplets forming on a freezing surface. If your actual complaint is water running down the walls, paint alone — either type — isn't the whole fix; ventilation and heating are.

Side by side

What about "damp resistant paint" and "fungicidal paint"?

Two more labels worth decoding. Fungicidal paint is simply another name for anti mould paint — a coating with a biocide in the film, which is exactly what Legacy is. Damp resistant paint usually means a barrier coating designed to hold back moisture coming through the wall from outside or below. That's a building-repair product for after you've fixed a leak or damp course — it does nothing about mould landing on the room side. If a wall is wet from penetrating or rising damp, no paint in this article is the answer until the source is fixed.

So which one do you need?

• Black spots keep returning in the bathroom, kitchen or bedroom corners → anti mould paint. Kill and clean the existing growth first (here's how), then two coats of Legacy.
• Heavy droplets on a cold external wall, little or no mould → anti condensation paint may help, alongside ventilation and heating.
• Both problems → deal with the mould risk at the surface (Legacy) and the moisture at source: extractor fans, trickle vents, drying clothes outdoors. Paint is the shield; airflow is the cure.

Frequently asked questions

Can I use both types together?
You can — anti condensation coating first, fungicidal coat on top — but for most rooms it's unnecessary. Pick the one matching your main symptom.

Is anti mould paint the same as fungicidal paint?
Yes. Fungicidal paint is the technical name for a paint with an in-film biocide.

Will either fix rising damp?
No. Rising and penetrating damp are building faults. Fix the source, dry the wall, then paint.