A water-based acrylic paint formulated for high-humidity rooms, containing a mildew inhibitor, in a satin or semi-gloss finish. That covers the great majority of bathrooms.
- What makes bathroom paint different
- Choosing the sheen
- The matte rule has changed
- Not every bathroom needs the same paint
- Ceilings and trim need separate answers
- What to look for on the tin
- Preparation matters more than the paint
- Letting the paint cure before you use the room
- What paint cannot fix
- Conclusion
- Frequently asked questions
- Related Articles
Two things are worth knowing beyond that. Not every bathroom needs the same paint, because a downstairs cloakroom and a family bathroom with a daily shower are different environments. And the old rule that you must never use a matte finish in a bathroom is no longer quite true.
What makes bathroom paint different
Three things separate a bathroom paint from standard wall emulsion.
The first is a mildew inhibitor. Bathroom paints contain additives that stop mould and mildew colonising the paint surface. Worth being precise about what that does: it slows growth on the film, it does not kill existing mould and it does not stop mould growing behind the paint.
The second is a tighter film. Bathroom formulations are less porous, so steam and splashes sit on the surface instead of soaking in. Standard matte emulsion is comparatively open, which is why it darkens in patches and eventually blisters in a steamy room.
The third is scrub resistance. Bathroom walls get wiped, and a paint that burnishes to a shiny patch every time you clean it will look worse each year. Bathroom paints are built to survive repeated washing.
The base matters too. Acrylic and modern water-based paints handle humidity well and stay flexible. Traditional oil-based paint is durable but yellows in a room with little natural light, and has largely been replaced by water-based enamels for trim.
Choosing the sheen
Sheen has traditionally been the main lever, because a higher sheen means a smoother, less porous film that resists moisture and wipes clean more easily. The trade-off is that shine shows every flaw in the wall underneath.
| Sheen | Moisture resistance | Hides flaws | Best used for |
| Standard matte or flat | Poor | Best | Not a bathroom |
| Bathroom-specific matte | Good | Best | Walls, where you want a flat look |
| Eggshell | Moderate | Good | Cloakrooms and half baths |
| Satin | Good | Moderate | Walls in most bathrooms |
| Semi-gloss | Very good | Poor | Trim, doors, splash-prone walls |
| Gloss | Best | Worst | Woodwork only |
Satin is the sensible default for bathroom walls. It resists moisture well, cleans easily, and is forgiving enough not to spotlight every imperfection in the plaster.
Semi-gloss belongs on trim, doors, and window frames, and on walls in a shower room or anywhere that gets directly splashed. It is the most washable option that still looks acceptable across a whole wall.
Full gloss is for woodwork only. On a wall it reflects too hard and shows every ripple.
The matte rule has changed
For years the advice was blanket: never use flat or matte in a bathroom. That was sound when sheen was the only thing determining how tight the paint film was.
It is no longer the whole picture. Several manufacturers now make bathroom-specific paints in a matte finish, engineered to resist moisture through the formulation rather than through shine. Benjamin Moore’s Aura Bath & Spa is the clearest example, sold explicitly as a matte bathroom paint for high-humidity environments with mildew resistance built in.
The practical rule is now more useful than the old one. What matters is whether the paint is formulated for bathrooms, not what sheen it happens to be. A bathroom-specific matte will outperform a general-purpose satin in a steamy room.
The caveat is cost. These products sit at the premium end, and if the budget matters more than the finish, a mid-range satin in a bathroom range does the job perfectly well.
Not every bathroom needs the same paint
Match the paint to how wet the room actually gets, rather than to the word “bathroom”.
A cloakroom or half bath with a basin and no shower is barely a humid room at all. Eggshell is fine, and a good quality washable matte will survive indefinitely.
A family bathroom with a daily shower or bath is the standard case. Satin or a bathroom-specific matte on the walls, semi-gloss on the trim.
A small ensuite with poor ventilation is the hard one. Everything condenses on cold surfaces, and this is where you want a dedicated bathroom paint with mildew inhibitors and the highest sheen you can live with.
A wet room or shower enclosure needs more than paint on the wet walls. Paint belongs on the surfaces outside the splash zone, with tiling, panelling, or a tanked system doing the work where water actually lands.
Ceilings and trim need separate answers
The ceiling is usually the first thing to fail, because steam rises and condenses there and it is the surface people forget.
Standard ceiling paint is a very flat, very porous emulsion designed to hide imperfections in a dry room. In a bathroom it is the wrong product. Use a bathroom-rated paint on the ceiling as well, or a ceiling paint that specifically includes a mildewcide.
Trim, doors, and window frames want a water-based enamel or a semi-gloss in a durable range. They take direct splashes, get touched with wet hands, and benefit from the extra hardness.
Radiators and pipework need a paint rated for heat if you are painting them, since ordinary wall paint will discolour.
If you are painting bathroom cabinets, treat it as a furniture job rather than a wall job. Degrease thoroughly, sand, prime with an adhesion primer, and use a cabinet or trim enamel.
What to look for on the tin
Bathroom paint is a marketing category as much as a technical one, so it helps to know which words carry weight.
Look for the room named explicitly. Products described as bathroom, kitchen and bathroom, or high-humidity paint have been formulated and tested for the conditions. That is the single most reliable signal on the shelf.
Look for a stated mildew or mould resistance claim. Phrases like mildew resistant or contains a fungicide mean an inhibitor is present in the film. Its absence usually means there is not one.
Look for a moisture or steam resistance claim, and for scrubbability. Manufacturers often quote a wash or scrub rating, and a higher number means the finish survives more cleaning before it burnishes.
Treat “durable” and “washable” on their own as weaker signals. Plenty of general-purpose paints carry both and are still too porous for a steamy room.
Check the recommended surfaces and the minimum application temperature on the back. Bathrooms are often the coldest room in the house in winter, and most water-based paints need the surface above about 10°C to form a proper film.
Preparation matters more than the paint
The best bathroom paint in the world will fail on a badly prepared wall, and bathroom walls carry contamination that other rooms do not.
Wash the walls first. Soap residue, shampoo overspray, hairspray, and body oils all build up invisibly and stop paint gripping. A sugar soap or general-purpose degreaser and a rinse deals with it.
Deal with mould properly rather than covering it. The EPA is explicit that you should not paint over mouldy surfaces: clean the mould off and dry the surface first, because paint applied over mould is likely to peel. Their guidance is that a patch under roughly 10 square feet is a reasonable job to handle yourself, scrubbing hard surfaces with detergent and water and drying them completely, while anything larger or involving water damage warrants proper remediation.
Prime any stains. Water marks and old mould staining bleed through fresh paint, and a stain-blocking primer is the only reliable way to stop it.
Sand any glossy existing paint to dull it. New paint will not grip a shiny surface.
Then let the room dry properly before you start, and keep it ventilated while the paint cures.
Letting the paint cure before you use the room
This step gets skipped more than any other, and it undoes good work.
Paint is touch dry within a couple of hours, but curing, when the film reaches full hardness and moisture resistance, takes far longer. Most water-based wall paints need two weeks or more to reach that point.
Steam on a fresh, uncured film is the problem. Showering the same evening you finish can leave the paint soft, patchy, or marked where condensation runs down it, and in a poorly ventilated room it can lift the film altogether.
Give it as long as you practically can. A full day before the room goes back into normal use is a reasonable minimum, two or three days is better, and it is worth showering elsewhere for that period if there is another bathroom in the house.
Keep the room ventilated throughout. An open window and the extractor running speeds the whole process up and reduces the humidity the fresh paint has to cope with.
Go easy on cleaning for the first couple of weeks. Wiping a wall that has not fully hardened will burnish it, leaving shiny patches that only another coat will fix.
What paint cannot fix
This is the honest part, and it saves people repainting the same room every two years.
Mildew-resistant paint slows growth on the surface. It does not address why the room is damp.
The EPA’s own bathroom advice makes the point plainly: where mould keeps reappearing in a bathroom, more ventilation and more frequent cleaning are what usually stop it recurring. Paint is not on that list.
So if your bathroom has no extractor fan, or one that vents into a loft rather than outside, or a window that never gets opened, fix that first. An extractor rated for the room size, run during and for a while after every shower, does more than any paint.
Persistent damp on an external wall, black staining in a cold corner, or paint peeling in sheets are signs of a building problem rather than a paint problem. Repainting will hide it briefly and it will come back.
Conclusion
Buy a water-based acrylic from a bathroom or kitchen range, with mildew inhibitors, in satin for most walls and semi-gloss for trim. If you want a flat finish, buy a bathroom-specific matte rather than a standard one, since the formulation matters more than the sheen now. Wash the walls, remove any mould properly before painting, and prime stains. And if mould keeps returning, sort the ventilation out, because no paint solves a moisture problem.
Frequently asked questions
Can you use regular paint in a bathroom?
In a cloakroom with no shower, yes. In a bathroom that gets steamy, standard matte emulsion is porous, marks easily, and is prone to mildew. A paint from a bathroom range costs a little more and lasts considerably longer.
Is satin or semi-gloss better for a bathroom?
Satin for walls, semi-gloss for trim and shower-adjacent areas. Semi-gloss resists moisture better and is more washable, but the extra shine highlights any unevenness in the wall surface.
Does mould-resistant paint actually work?
It inhibits mould growing on the paint surface, which helps. It does not kill existing mould and does not stop mould forming behind the paint or in grout, so it works alongside good ventilation rather than instead of it.
Can you paint over mould in a bathroom?
No. The EPA advises cleaning mould off and drying the surface before painting, because paint over mould is likely to peel. Scrub hard surfaces with detergent and water, dry them completely, then prime and paint.
What paint should you use on a bathroom ceiling?
A bathroom-rated paint or a ceiling paint containing a mildewcide. Standard flat ceiling paint is highly porous and the ceiling is where steam condenses first, so it is the worst place to economise.
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