How to Paint Interior Baseboards and Trim

Baseboards are the unsung heroes of your room's architecture, framing your floors and hiding the inevitable gaps where wall meets wood. When they are dingy, scuffed, or yellowed, the entire room feels tired regardless of how clean your walls might be. A fresh coat of high-quality trim paint acts as a crisp anchor, pulling the room together and creating a sharp visual boundary that makes everything else pop. Getting a professional look comes down to one thing: patience during the prep phase. If you rush the sanding or the taping, the paint will peel or bleed, leaving you with a messy aesthetic that draws the eye for all the wrong reasons. Done well, your trim will look like it was sprayed on, smooth to the touch and durable enough to handle the daily abuse of vacuum cleaners and rogue foot traffic.

Clear the Stage First. Remove all furniture away from the baseboards to give yourself full access. Wipe down all trim with a degreasing cleaner to remove years of floor dust, pet hair, and surface oils.
Rough Up the Surface. Lightly sand all trim surfaces using 180-grit sandpaper. This creates a profile for the new paint to bite into and smooths out any existing brush strokes or imperfections.
Seal the Edges Tight. Apply painter's tape along the edge of the floor and the wall. Press the edges of the tape down firmly with a putty knife to create a tight seal against bleeding.
Fill Every Crevice. Use a paintable latex caulk to fill nail holes and small gaps between the trim and the wall. Smooth the caulk bead with a wet finger and let it dry according to the tube instructions.
Paint with Precision. Use a 2-inch angled sash brush to apply your trim paint. Start at one end and work in long, steady strokes, maintaining a 'wet edge' to prevent visible overlap marks.
Seal the Professional Finish. Wait for the first coat to fully cure—usually four to six hours—before lightly scuffing with 220-grit sandpaper. Wipe clean and apply your second and final coat for full coverage.