The best paint for bathroom walls is built for steam, not shine

What the best paint for bathroom walls has to do

Bathroom wall paint has to handle daily humidity and condensation, resist mildew on its surface, stand up to scrubbing, and cure hard before steam reaches it. Color and sheen come after those four jobs.

• Moisture: steam and condensation reach the walls every day, not once a season.
• Mildew resistance: a preservative in the paint that holds back growth on the dry film.
• Scrubbability: you'll be wiping toothpaste, hairspray and soap off these walls for years.
• Cure before steam: a film that's dry to the touch is still soft underneath.

The vanity faces the same steam, with doors that get handled too. Our post on painting a bathroom vanity covers that piece. This one is about the walls.

Bathroom wall paint types compared

The last three columns are our editorial guide, not a measurement.

Mildew resistant doesn't mean mold proof

A mildew inhibitor protects the paint film, not the wall behind it. One Dunn-Edwards data sheet for a matte wall paint says the paint contains a preservative that inhibits mildew on the surface of the dry film. The same sheet is plain that the paint can't prevent or cure mold, that too much moisture and too little ventilation are what grow it, and that those should be fixed before painting.

EPA puts it more bluntly: don't paint or caulk moldy surfaces. Clean the mold up and dry the surface first, because paint applied over mold is likely to peel. Our bathroom painting guide walks through the cleanup.

Scrubbability: look for a number, not a word

Washable on the front of a can isn't a measurement. A data sheet can be. That same matte paint reports more than 4,000 cycles in a standard scrub test (ASTM D2486), plus a burnish test that measures how much a rubbed patch gains shine. A result like that tells you more than the sheen name does, and here it belongs to a matte.

Which sheen for bathroom walls?

Satin or semi-gloss is the usual pick for a room with a shower, because both wipe down easily. Eggshell can work in a powder room, or wherever the data sheet backs it up. Glossier paint shows dents and patches, so the wall prep matters more. Our paint sheen guide explains each level, and the right finish for each room covers the rest of the house.

The Steam Ladder: the best paint for bathroom walls, room by room

Most roundups name one best paint for bathroom walls, as if every bathroom were the same. A powder room and a kids' shower bath aren't. We sort bathrooms by how much water reaches the walls, then match the paint to the rung. It's our editorial framework, not a lab standard.

Most family bathrooms sit on rung 2, where the paint and the fan work as a pair. Rung 1 is the place for a bold color; our post on powder room paint colors has ideas. Rung 4 is a repair before it's a paint job, and how to fix peeling paint explains the usual causes.

Why new bathroom paint streaks, and how to stop it

Glossy, tan or brown streaks on fresh bathroom paint have a name. Dunn-Edwards calls it surfactant leaching: the soap-like ingredients every water-based paint needs can rise to the surface while the film dries in cool, damp air, and water spreads them into streaks. Its bulletin names bathrooms as an example indoors.

Deep colors are more prone, it says, because colorant adds surfactant. The streaks aren't a threat to the paint film. On interior walls they can usually be washed off within a week, once the paint has cured and hardened, using a mild soapy solution and a soft cloth, then a rinse. In bad cases they come back once or twice.

To prevent them, the bulletin's advice for interiors comes down to three habits:

1. Paint when the room is warm and dry, and never below 50 degrees.
2. Let fresh paint cure and harden before it sees steam, condensation or washing.
3. Skip that shower for several days, until the walls are fully dry.

Dry to the touch isn't ready for steam

The matte paint's data sheet lists dry to the touch in 30 to 60 minutes and a recoat in two to four hours, and says both depend on temperature, humidity and film thickness. Hardening takes far longer. Our post on dry time and cure time explains the gap, and painting in high humidity covers muggy weeks.

In a bathroom, the fan matters more than the paint

The Building America Solution Center, funded by the U.S. Department of Energy, says bathroom exhaust fans remove moisture to keep relative humidity down, which discourages condensation and the growth of mold and mildew. It calls for a fan that vents outdoors, not into an attic, a crawlspace or the space between floors.

It also recommends running the fan for one hour after a shower, ideally on a timer switch that shuts it off for you. For size, it cites a minimum of 50 cubic feet per minute for a fan run on demand, under ASHRAE 62.2 and the International Residential Code, and says ENERGY STAR suggests a fan rated at least 70.

EPA adds that where mold keeps returning in a bathroom, more ventilation and more frequent cleaning will usually keep it to a minimum. No label beats that. If your fan is loud, weak or vents into the attic, have it fixed before you repaint. The ceiling over the shower gets the worst of the steam; see the best ceiling paint for that surface.

When to stop and call a professional

• Stop if mold covers more than about 10 square feet, or after a lot of water damage. EPA points to its remediation guidance at that size.
• Stop if the drywall around the tub or shower is soft, swollen or stained. That points to a leak, and paint won't hold on it.
• Stop scraping peeling paint if your home was built before 1978 and you don't know what's in it.
• Get the moisture source found when mildew returns within weeks of cleaning, or paint keeps peeling in the same spot.

The third one matters in older Madison houses. EPA says approximately three quarters of U.S. homes built before 1978 still contain some lead-based paint, and that any painting project in a home that has it can easily create dangerous lead dust. Tell any painter the age of the house. See painting older Madison homes.

How we paint bathrooms at GK Painting

Bathrooms are part of our interior painting. We cover the floor and everything nearby before the first can is opened, repair and prime small holes, and clean up when we're done. George quotes every job himself and walks the finished room with you.

We use premium paint from Sherwin-Williams and Behr, and Behr is the more economical of the two. If you'd rather use a brand you already like, we'll use it, and your written quote is built around the paint you pick. The written quote is the price, no extra charge if the job takes longer than expected.

If a problem comes from the quality of our work, like a finish that peels or didn't bond, tell us and we'll come back and make it right; our promises spell it out. We're based in Waunakee and work across Madison and Dane County. When you're ready, ask for a free estimate.