How do you paint a room?
Painting a room is four jobs in order: clear and protect, prep and repair, cut in the edges, then roll the field. Prep decides how the finish looks; the rolling is the fastest part. Plan two coats and a full day for an average bedroom.
Short version
- Do the ceiling first, then walls, then trim. Gravity and overspray both work downward.
- Cut in one wall and roll it while the cut line is still wet, or the edge will flash.
- Sand and patch before you open the paint. Nothing hides a bad surface.
- Two thin coats beat one heavy one, every time.
Clear the room and protect what stays
Move what you can out. Group the rest in the centre and cover it. Take down switch plates and outlet covers rather than taping around them — the tape line always reads as a tape line. Lay canvas drop cloths, not plastic, on the floor: plastic is slick underfoot and holds spills in a puddle instead of absorbing them.
Prep is the part that decides the result
Wash anything greasy, especially above a radiator or near a kitchen. Fill nail holes and dents, let the filler dry, then sand flush. Sand any glossy existing paint until it loses its shine so the new coat has something to grip. Vacuum the dust and wipe with a damp cloth.
If the house was built before 1978, do not sand or scrape until you have read the lead guidance. Dry-sanding old paint is exactly the activity the federal rule exists to control.
Cut in, then roll, one wall at a time
Cut a two-inch band along the ceiling, the corners and the trim with a good angled brush. Then roll that same wall before the cut band dries. If the cut dries first you get a visible halo where brush and roller textures meet — the defect painters call flashing or picture-framing.
Roll in overlapping passes and finish each section with a light, floor-to-ceiling pass to even the texture out. Keep a wet edge and do not go back over paint that has started to set.
Second coat and cleanup
Wait for the recoat time on the can, which is a product-specific number and is usually longer than the "dry to touch" time. Pull tape while the final coat is still slightly soft, pulling back on itself at a shallow angle.
Common mistakes
- Skipping the sanding step on glossy trim. The new coat will peel off in sheets within a year.
- Taping around outlets instead of removing the covers.
- Cutting in the whole room first, then rolling. Every cut line will flash.
- Recoating on "dry to touch" instead of the product's stated recoat time — the first coat lifts.
- Sanding or scraping pre-1978 paint without checking the lead rules first.
Related questions
Sources
- US Environmental Protection Agency. Renovation, Repair and Painting Program (accessed 2026-08-17).
- Sherwin-Williams. Interior painting technical data sheets (accessed 2026-08-17).
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