Damp patches, peeling paint and dark spots of mould are some of the most common problems in British homes, especially in bathrooms, kitchens, basements and any room where moisture builds up. Specialist interior paints can help enormously, but only if you choose the right type and use it correctly. This guide explains the difference between anti-damp, anti-mould and anti-condensation paints, where each one works best, and the one thing you must do first for any of them to last.
What causes damp and mould indoors?
Before choosing a paint, it helps to know what you are dealing with, because the cause affects the cure:
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Condensation. By far the most common. Warm, moist air (from cooking, showering, drying laundry) hits a cold wall or ceiling and turns to water, feeding mould.
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Penetrating damp. Water getting in from outside through a defect such as cracked render, a leaking gutter or failed pointing.
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Rising damp. Moisture drawn up from the ground where a damp-proof course is missing or bridged.
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Poor ventilation. Trapped humid air with nowhere to go, which makes condensation and mould far worse.
What is anti-damp paint?
Anti-damp paint, sometimes called damp-seal or damp-proof paint, is designed to create a moisture-resistant barrier on the wall surface. It helps block damp staining coming through, resists surface moisture, and gives you a sound base to redecorate over. Some products can even be applied to slightly damp masonry, which is useful for turning a room around quickly.
What is anti-mould paint?
Anti-mould paint contains a fungicide or biocide that actively inhibits the growth of mould and mildew on the painted surface. Standard emulsion offers no such protection, so in a humid room it can quickly grow black spots again. Anti-mould paint keeps the surface cleaner for longer and is a sensible choice for bathrooms, kitchens and any room that struggles with recurring mould.
What is anti-condensation paint?
Anti-condensation paint tackles the root of surface condensation. It is formulated with insulating microspheres that keep the wall surface a little warmer, so warm, moist air is far less likely to condense on it in the first place. Many of these paints also include fungicidal additives to resist mould, and give a breathable, slightly textured matt finish that lets moisture evaporate naturally.
Our anti-condensation paint range, including the trusted Coo-Var Anti-Condensation Paint, is made exactly for bathrooms, kitchens, basements, laundry rooms and other spaces where humidity is a recurring problem.
Anti-damp vs anti-mould vs anti-condensation: a quick guide
|
Paint type |
Main job |
Best for |
|
Anti-damp / damp-seal |
Resist surface moisture and block damp staining |
Walls affected by surface damp, ready to redecorate |
|
Anti-mould |
Inhibit mould and mildew growth |
Bathrooms, kitchens, recurring mould spots |
|
Anti-condensation |
Warm the surface to reduce condensation forming |
Cold walls and ceilings in humid rooms |
Plenty of products blur these lines, combining biocidal protection with moisture resistance, which is often exactly what a damp, mould-prone room needs.
The most important step: fix the cause first
Here is the honest truth that saves a lot of wasted effort. Specialist paint manages the symptoms on the surface, but it does not cure the underlying problem. If a wall is wet because of a leak, a bridged damp-proof course or serious rising or penetrating damp, painting over it will only shift the problem or delay its return. The moisture is still in the wall.
So before you paint: improve ventilation, fix any leaks, gutters or external defects, remove the source of excess humidity where you can, and let the wall dry out as much as possible. Get the cause under control and the right paint will then do its job for years. Skip that step and even the best coating will struggle.
How to paint a damp or mould-prone room
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Treat the mould. Remove existing mould with a proprietary mould remover so the spores are killed rather than painted over. Let the surface dry.
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Prepare the surface. Scrape off loose or flaking paint, clean away dirt and grease, and repair any damaged plaster.
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Let it dry. Allow the wall to dry as much as the product allows. Some anti-damp paints tolerate slightly damp masonry, but check the tin.
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Apply the specialist coating. Use your anti-damp, anti-mould or anti-condensation paint following the recommended number of coats and recoat times.
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Redecorate if needed. Many of these coatings can be overpainted with a breathable decorative finish once cured.
Where to use these paints
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Bathrooms and wet rooms. High humidity and splashing make these prime candidates. For the full picture on paints and waterproofing in these spaces, see our guide on wet room and bathroom paints.
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Kitchens and utility rooms. Steam, cooking moisture and laundry all raise humidity.
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Basements and cellars. Naturally cool and prone to damp and condensation.
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Bedrooms with cold external walls. Where condensation and mould appear behind furniture or around windows.
Choosing the right interior paint
The right choice comes down to the problem you are solving: reach for anti-condensation paint where cold surfaces and condensation are the issue, anti-mould paint where recurring mould is the enemy, and anti-damp or damp-seal paint where you need to resist surface moisture and staining before redecorating. Browse the full interior paints range to find a suitable finish, and if you are unsure, Trade Supplies UK offers free technical advice to help you match the paint to the room.
Treat the cause, prepare properly and pick the right specialist coating, and you can keep interior walls dry, clean and mould-free for the long term.
