A bathroom fights your paint every day. Steam, splashes, and temperature swings push moisture into the walls, and sooner or later a standard finish starts to bubble, streak, or flake. Catch it early and the fix is a weekend job, not a mold problem.
The trick is to treat the room like the wet space it is: the right paint, honest surface prep, and enough cure time before the first hot shower. Do those three things and the finish holds for years.
Here is exactly how to prep, prime, and paint a bathroom so it lasts.
Key Takeaways
- Use bathroom-specific paint: A satin or semi-gloss acrylic latex with mildew-resistant additives sheds moisture and wipes clean.
- Prep decides how long it lasts: Kill mildew with a three-to-one water-and-bleach wash, degrease with TSP, patch, then sand glossy spots.
- Prime before you paint: A moisture-resistant primer seals the wall and stops the topcoat from peeling.
- Wait to shower: Skip steam for 24 to 48 hours; the film needs about a week to fully cure and become washable.
What You Need
Gathering your tools before you start saves a paint-covered trip to the hardware store mid-project. Here is what it takes to paint a bathroom:
- Paint roller and covers: Match the nap thickness to your wall texture.
- 2-inch sash brush: Angled bristles make cutting in around the toilet and vanity easier.
- Paint tray and liners: Speeds up cleanup.
- Screwdrivers: Flat-head and Phillips for switch plates and vent covers.
- Plastic sheeting: Shields fixtures and floors from splatter.
- Painter’s tape: Keeps lines clean along trim and the ceiling.
- TSP (trisodium phosphate): Cuts soap scum and grease.
- Household bleach or a mildew cleaner: Kills existing mold spores before you paint over them.
- Spackle and sandpaper: Patch holes and dull old glossy paint.
- Bathroom-grade acrylic latex paint: Formulated with mildew-resistant additives.
How To Paint a Bathroom
Before you open a can, choose the right mold-inhibiting paint. A bathroom is a wet room, and standard flat paint soaks up moisture like a sponge.
Look for “Bathroom” or “Kitchen” on the label. Those paints carry antimicrobial additives that resist mildew and are built to handle high humidity without peeling or bubbling. Premium lines also pack in more solids, which dry to a thicker, harder acrylic shell. Cheaper paint leans on solvents that evaporate and leave a thin coat that gives up fast.
1. Calculate Coverage
Measure your walls and multiply length by height for the square footage, then check the coverage figure on the can. As a rule of thumb, a gallon of interior paint covers about 350 to 400 square feet per coat, and a gallon of primer stretches to roughly 200 to 300 square feet (1).
Do not subtract the window and door openings from your total. Rounding up leaves a little extra for touch-ups later, and a bathroom rarely takes more than a gallon or two.
2. Prepare The Surfaces
Prep is what makes a paint job last. Soap scum, hairspray, and dust all keep new paint from bonding, so the walls have to be clean and sound first.
If you spot any active mold or mildew, kill it before it goes under the paint. Wash those spots with three parts water to one part household bleach, or a cleaner made to kill mildew, then rinse and let the wall dry fully. Painting over live spores just traps them, and they bleed back through.
Next, scrub the whole surface with trisodium phosphate (TSP), which cuts bathroom grime better than ordinary soap. Fill nail holes and cracks with spackle. Finally, sand the walls lightly to knock down bumps and dull any old glossy paint so the new coat has something to grip.
3. Remove Obstacles
Clear access gives you a cleaner finish. Take off the outlet covers, switch plates, towel bars, and vent covers.
Painting behind the toilet is usually the fiddly part. With a steady hand you can slide a small roller or brush behind the tank. For a cleaner result, pull the tank: shut off the water valve, flush to drain it, disconnect the supply line, and unscrew the bolts. Not comfortable with the plumbing? Tape around it and move on.
4. Mask Off the Room
Run painter’s tape along the trim, the bathroom ceiling edge, and around the bathtub or shower surround. Press it down hard with a putty knife so paint cannot bleed underneath.
Cover the sink, toilet, and floor with drop cloths or plastic. A bathroom is tight, so splatter finds every surface.
5. Apply Primer
Do not skip the primer. Humidity hunts for weak spots, and a moisture-resistant primer seals the drywall and lays down a barrier against water vapor.
Apply one to two coats, then wait two to four hours for it to dry. Roll your topcoat over wet primer and it slides right off.
6. Cut In the Edges
Open the can and stir the paint thoroughly to remix the pigments and solids.
Dip your 2-inch sash brush about a third of the way in. Paint a 2-inch strip along the ceiling line, corners, baseboards, and around the fixtures. This border, called “cutting in,” reaches the spots a roller cannot.
7. Roll the Walls
Load the roller from the tray until it is saturated but not dripping.
Start in a corner and roll a loose W shape, then fill it in with straight vertical strokes. Keep a “wet edge” by rolling back into the previous section before it dries. That blends the passes and prevents lap marks.
8. Apply a Second Coat
Most bathrooms need two coats for full coverage and even color. Wait at least two to four hours for the first coat to dry.
Top Tip
If the room is cold or humid, drying times can double. Run a fan to move the air.
Repeat the routine: cut in the edges again, then roll the final coat.
9. Cleanup and Curing
Pull the painter’s tape while the second coat is still slightly tacky. Wait until it is bone dry and you risk peeling fresh paint off with it.
Reinstall your hardware and covers, then leave the room alone for a bit. The paint feels dry to the touch within a few hours, but the film keeps hardening for about a week before it is fully cured and washable (2). Hold off on the shower for at least 24 to 48 hours. Hit fresh paint with steam too soon and the surfactants can leach out, leaving soapy streaks on the wall. Running the bathroom fan during this window helps too: the EPA advises keeping indoor humidity below 60 percent, ideally between 30 percent and 50 percent, and drying any wet surface promptly to keep mold from taking hold (3).
Bathroom Painting Tips
A few habits make a small, damp room easier to paint. Here are the ones worth borrowing from the pros.
Choose the Right Sheen
Flat and matte paints soak up moisture and are hard to wipe down, so they are the wrong call for a bathroom. Reach for satin or semi-gloss near the shower and sink instead. Higher-sheen paints pack tighter resin binders, which cure into a harder, less porous surface that sheds water and gives mold less to grab onto.
Keep a Damp Rag Ready
In a tight space you will bump a wet wall or drip paint. Loop a damp cloth through your belt and wipe up mistakes right away, before they dry onto the tile or vanity.
Line Your Tray With Foil
Rinsing a paint tray in the bathroom sink is messy and can clog the drain. Line the tray with aluminum foil before you pour. When you finish, fold the foil in on itself and toss it, and the tray stays clean.
Use an Extension Pole
Bathrooms hide tight gaps behind the toilet and above the vanity where a ladder will not fit. A short extension pole on your roller lets you reach high spots and ceiling lines safely from the floor.
