How to paint a room

The order is about drips, not tradition

Sherwin-Williams’ painting FAQ puts the usual interior order in one line: ceiling first, walls second, trim last. The reason is mechanical. A roller on the ceiling throws spatters, and a brush at the wall-ceiling line drips. If the walls and the baseboard are already finished, those spatters land in the new film. If the ceiling is done first, the drips land on a surface you are about to paint anyway. Their project page says the same thing and adds the trim reason in the other direction: painting trim last keeps wall-roller splatter off the fresh woodwork.

The same FAQ notes a new-construction variant. Ceilings and walls are often primed before the trim is installed, still with the ceiling first, and the trim is primed and finished after it is up and the joints are caulked. On a repaint, you rarely have a long gap between trim and walls, so they do not suggest painting the trim first and then trying to mask it. There is usually not enough dry time for tape to go onto fresh trim paint safely.

If you are also painting the floor, their older order sheet puts the floor last, starting in the corner farthest from the door. Most rooms are not a painted floor. Ceilings, walls and trim are the three that matter.

Before the first brush stroke

The wall should already be washed, patched, sanded where it was glossy, and primed where it needed primer. That work is prep and primer. Stir the paint. If you have more than one can of the same color, mix them together in a larger bucket so a small tint difference between cans does not show up as a stripe. Lay drop cloths, and tape only once the surface under the tape is dry.

Sherwin-Williams’ materials list for painting the room itself is short: paint, a separate container to work from, a tray, stir sticks, a 2- to 3-inch angled sash brush, a roller and covers, an extension pole if you need one, a drop cloth, painter’s tape, rags and a ladder. Check the can for the temperature window. Several interior latex paints we have read list 50°F as a minimum for air and surface. A cold garage-stored can is not at room temperature just because the room is. Quantity, so you are not stopping mid-wall for another gallon, is how much paint you need.

Ceilings

Use a low-luster or flat paint on a ceiling if you want less reflection. Sherwin-Williams suggests low-luster for minimal reflection, and a thicker roller if the ceiling is textured. Flat is also the finish Benjamin Moore and Sherwin-Williams list for ceilings in the sheen guides, because it hides joints and does not glare under a window. Color choices for that “fifth wall” are in ceiling paint color.

Cut in before you roll, but not the whole ceiling at once. With an angled brush, paint a band about 2 to 3 inches wide where the ceiling meets the wall or the crown molding. Their how-to says to start along the shorter side of the room. In a 20-by-12-foot room, that is one of the 12-foot walls. While that band is still wet, roll into it and come as close to the edge as you can. Overlap each roller pass. An extension pole lets you keep the roller at a steady pressure instead of reaching. Smooth ceilings take a shorter nap; textured ceilings take a thicker one, which is the same nap rule Sherwin-Williams gives for walls with poor hiding: about 1/4 or 3/8 inch on smooth surfaces, 3/4 inch or more on texture.

Walls, and the wet edge

There is a persistent habit of cutting in every edge in the room, taking a break, and then rolling. Sherwin-Williams calls that a myth. You do want a 2- to 3-inch band along the ceiling, the baseboard, the trim and the inside corners. You want to cut in only as far as you can roll while that band is still wet. Roll from the unpainted area back into the wet paint, in an N or a W, overlapping the band. The goal is one continuous film, not a brushed stripe with a rolled field butted against it after the stripe has started to set. A set edge is how lap marks happen. The failure and the fix are in flashing and lap marks.

On a large wall you will not win a race against the whole perimeter. Break the wall into sections you can cut and roll as one piece, and plan the stops at corners, doors or windows. Their how-to says exactly that: if the room is too big to keep the cut-in wet, edge and finish smaller portions.

Brush handling, from the same lesson: hold the brush near the base of the handle, just above the bristles. Dip until the bristles are about half covered. Tap the brush on the inside lip of the container. Wiping across the rim pulls off too much paint. Use enough pressure to bend the bristles slightly. Pushing harder makes the paint run out of the heel of the brush and drip.

A 2-inch or 2-1/2-inch angled brush is what they suggest for control around window and door trim. The roller does the field. Come close to the cut-in with the roller so you are not leaving a wide brushed picture frame that dries to a different texture.

The second coat

Let the first coat dry for the recoat time on the can, not merely until it feels dry to a fingertip. Sherwin-Williams’ order page says people typically wait 2 to 4 hours between coats and tells you to check the label, because products differ. One interior latex semi-gloss data sheet from the same company, SuperPaint A88, lists 1 hour to touch and 4 hours to recoat at 77°F and 50% relative humidity, and says those times depend on temperature, humidity and film thickness. A cool, damp room is not the lab. The three clocks, touch, recoat and cure, are sorted out in dry time versus cure time.

Two coats are the ordinary way to get even color, especially over a different color. Benjamin Moore’s note on paint-and-primer products says two coats develop the color fully even when one coat seems to cover. Deep and bright colors hide less; plan for that before you start, not after the first coat looks blotchy. See painting over a dark color.

Trim, doors and windows last

Wait until the walls are thoroughly dry before you tape them along the trim. Sherwin-Williams says that directly. Tape on a soft wall film will pull paint off when you remove it, even if the tape is a delicate grade. Longer pieces of tape, pressed along the edge, leak less than a chain of short pieces.

They suggest a semi-gloss or gloss on trim because it is more durable and easier to clean than a wall flat. A smaller brush gives you a straighter line than a wall brush. Brush with the length of the trim, keep a wet edge along the board, and do not flood the profile details or the paint will pool in the grooves and wrinkle. Enamels made for trim often have much longer recoat times than wall paint. One waterborne alkyd we have cited needs 16 hours between coats. Read the can before you promise yourself the doors will be back up tonight.

Ventilate while you paint and while the film dries. The label cautions on ordinary interior latex tell you to open windows and doors, and to get more air or leave if you get a headache or watery eyes. What the VOC line on that label actually measures is how to read a paint label and low-VOC paint.

FAQ

Should I paint the walls or the trim first?

Walls first, trim last, on a normal repaint. Sherwin-Williams notes that painting trim first leaves it exposed to roller splatter, and fresh trim paint is usually not dry enough to mask safely before you roll the walls.

Do I cut in the whole room before rolling?

No. Cut in a 2 to 3 inch band only as far as you can roll while that band is still wet. Rolling into a dried cut-in line is a common cause of lap marks.

How long between coats of wall paint?

Check the can. Sherwin-Williams’ general room guide says 2 to 4 hours is typical. One of their interior latex semi-gloss data sheets lists 4 hours to recoat at 77°F and 50% humidity, and longer if it is cooler, damper or the coat is thick.

What roller nap should I use?

Shorter nap on smooth surfaces, about 1/4 to 3/8 inch in Sherwin-Williams’ hiding guidance, and 3/4 inch or more on textured walls or ceilings. A thick nap on a smooth wall leaves more stipple.

When can I tape the wall to paint the trim?

After the wall paint is thoroughly dry. Sherwin-Williams warns against taping freshly painted walls. “Dry to the touch” is not the same as cured; if the tape label has a wait for fresh paint, follow that.

Sources

1. The Best Order to Paint a Room (Sherwin-Williams)
2. Painting FAQs (Sherwin-Williams)
3. How-To Paint a Room (Sherwin-Williams)
4. 4 Paint Myths Busted (Sherwin-Williams)
5. Hiding (Poor): Causes and Solutions (Sherwin-Williams)
6. SuperPaint Interior Latex Semi-Gloss A88 product data sheet (Sherwin-Williams)
7. Paint and Primer in One (Benjamin Moore)

Sources checked October 27, 2026. Rules of thumb on this page are our editorial guidance, not standards.

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