How to Paint a Small Bathroom
How to paint a small bathroom properly: ventilation, moisture-resistant paint selection, prep around fixtures, cut-in technique, and preventing mildew long-term.
Decorate · Bathroom
A small bathroom is the fastest room in the house to transform with paint — and the easiest to ruin with the wrong product. Bathroom-rated paint, proper prep, and two coats are the non-negotiables. Everything else is technique.
What You'll Need
Tools: 2-inch angled sash brush (primary tool), 4-inch mini roller, putty knife, 120 and 220-grit sandpaper, painter's tape, drop cloth, sanding sponge, screwdriver.
Materials: Bathroom-rated semi-gloss or satin paint, stain-blocking primer, spackling compound, paintable caulk, TSP substitute for cleaning walls.
The Steps
01 · Remove all hardware
Take off towel bars, toilet paper holder, outlet covers, vent covers, and cabinet hardware. Store in a labeled bag. Paint around fixtures always looks amateurish; the 20 minutes of removal is worth it.
02 · Clean walls with TSP substitute
Mix 1/4 cup TSP substitute per gallon of warm water. Wash every wall top to bottom. Rinse clean. Hair spray, soap residue, and body oils prevent adhesion invisibly.
03 · Patch, sand, and caulk gaps
Fill holes with spackling. Sand smooth when dry. Apply paintable caulk to all gaps between wall and tub, vanity, and trim. Allow caulk to cure before painting.
04 · Prime stains and patches
Apply stain-blocking primer (Zinsser BIN or equivalent) over any water stains and bare patches. Water stains bleed through regular latex paint within a year without a proper block.
05 · Tape thoroughly
Tape ceiling line, all trim, tub edge, vanity backsplash, and around remaining fixtures. Press tape down firmly with a putty knife edge — not just a fingertip — to prevent bleed-under.
06 · Cut in all edges
Use a 2-inch angled brush. In a small bathroom, cut-in work is 70% of the job. Work one wall at a time; cut in, then roll while the edge is still wet to avoid lap marks.
07 · Roll open surfaces
Use a 4-inch mini roller. Apply in W-shapes, backroll vertically. Two moderate passes beats four thin ones. The only truly rollable surfaces in a 5×8 bathroom are small — work them efficiently.
08 · Second coat after full dry
Allow the first coat to dry to recoat per label (2–4 hours typical). Apply second coat same sequence: cut in, then roll. One coat is not enough for durability in a bathroom.
09 · Pull tape and reinstall hardware
Pull tape at 45° while paint is still slightly soft — 1–2 hours after the final coat. Touch up any bleed-under immediately. Reinstall all hardware.
10 · Ventilate 48 hours
Run the exhaust fan continuously for 48 hours. No hot showers for 24 hours. Proper cure = durable finish. Humidity during curing = permanently softened paint.