How to Paint a Room Like a Pro: Prep, Cut-In, Roll, Finish

Painting is the best value in home improvement: a weekend and a hundred dollars transform a room. It is also the project where prep work quietly decides the result. This is the full sequence, in the order that matters.

1. Calculate before you buy

Measure the wall run and height, count doors and windows, and run the Paint Calculator with your product’s listed coverage — most interior acrylics cover 350–400 ft² per gallon per coat. Two coats is the standard for a color change; deep, saturated colors often need a tinted gray primer coat underneath instead of a third topcoat.

2. Prep: 80% of the result

1. Clear and protect — Move furniture to the center, drop-cloth the floor. Remove outlet covers and switch plates — taping around them looks exactly like what it is.
2. Wash — Wipe walls with a damp sponge; kitchens need a mild detergent pass. Paint sticks to clean surfaces, not grease.
3. Repair — Fill nail holes with lightweight spackle; larger dings with joint compound. Let dry fully, sand smooth, wipe the dust.
4. Sand glossy surfaces — Any sheen higher than eggshell gets a light scuff-sand (220 grit) so the new coat bonds.
5. Tape with intention — Tape woodwork and ceilings only if your cut-in hand is not steady yet — a practiced brush beats tape on textured walls. Seal tape edges with a fingernail or putty knife.

3. Prime strategically

New drywall, repairs, stains, smoke or glossy-older paint all need primer. Otherwise you are buying expensive paint to do a primer’s job. The Primer Calculator handles the quantity.

4. Cut in, then roll — wet edge discipline

1. Cut in one wall at a time — A 2½ in angled sash brush, loaded one-third deep, paints a 2–3 in border at ceilings, corners and trim. Work top-down, one wall per session so the roll overlaps a wet border.
2. Roll a 3×3 ft "W" — Load the roller, roll a big W, then fill it without lifting. Keep the roller half-loaded; a starving roller streaks.
3. Feather as you go — Finish each section with light, overlapping strokes toward the painted area. Do not press hard — texture comes from pressure.
4. Second coat after full dry — Not "dry to touch" — the can’s recoat time, typically 2–4 hours. A too-early second coat peels the first.

5. Finish like you mean it

Pull tape at 45° while the final coat is slightly tacky — old tape pulls dried paint film with it. Inspect with raking light from a window; touch-ups need the same brush, same paint, feathered well beyond the defect. Reinstall covers after 24 hours.