How to Paint an Interior Door Without Brush Marks

D Doors act as the frame for every room in your home, and nothing cheapens a space quite like a streaky, brush-marked finish. Achieving a factory-smooth result isn't about expensive equipment; it is about managing the 'open time' of your paint—how long it stays wet before it begins to set—and using the right tool for each section of the door's geometry. When done well, the door should look like it was sprayed. You want a consistent, subtle eggshell or semi-gloss sheen that lacks the telltale ridges of a heavy hand. By following a specific order of operations and maintaining a 'wet edge,' you can turn a mediocre weekend project into a professional-grade upgrade that stands up to daily wear and tear.

1. Strip the Hardware First. Unscrew the handle, latch, and hinges to ensure a clean, uninterrupted surface. Scrub the door thoroughly with a degreaser or TSP substitute to remove oils and dust that prevent paint adhesion.
2. Create Tooth for Paint. Scuff-sand the entire door using 220-grit sandpaper. You are not trying to remove the old paint, just creating a profile so the new coat can bite into the surface.
3. Prime All Edges First. Apply a coat of high-quality bonding primer using a foam roller for the flat panels and a brush for the grooves. Once dry, lightly sand again with 320-grit paper to knock down any bumps.
4. Brush Panels While Wet. Use a 2-inch angled sash brush to paint the recessed panels and inside corners of the door. Work on one panel at a time and maintain a wet edge so the paint doesn't dry before you move to the stiles.
5. Roll Out the Brush Marks. Immediately use a high-density foam roller to paint the vertical stiles and horizontal rails. The roller will remove the brush strokes left by the cutting-in process, leaving a uniform stipple.
6. Catch Drips Before Set. Inspect for drips, especially along the edges or inside corners, and catch them with a lightly loaded brush. Let the door cure completely before re-attaching the hardware.