Use a thin flexible drywall knife tucked under the baseboard to create a moving barrier and paint along the edge quickly to avoid getting paint on the carpet.

Start by slipping a long flexible drywall knife or putty knife between the baseboard and carpet pile so the blade sits flush against the baseboard edge; this protects the carpet from direct brush contact and lets you work steadily along the length of the wall. Use a high quality angled sash brush about one to one and a half inches wide so you have control but can still cover a strip in a single pass; load the brush lightly and tap excess back into the can rather than wiping it. Hold the knife with your non dominant hand and position the brush in your dominant hand so the bristles ride the knife edge, beveling the paint away from the carpet as you move down the run. Work in short segments of about two to three feet so you can maintain wet edges and avoid lap marks, and keep a small bucket of water or solvent and a rag nearby to immediately remove any stray drips before they set. For corners and trim returns use the knife as a corner guard by angling it into the joint, and when you reach door casings switch to a narrow sash brush for precision; if you need extra protection tape a strip of folded construction paper over the carpet and under the knife for long runs. Choose a fast drying trim paint and work one wall at a time so you can inspect and touch up before full cure, and always remove the blade and check the carpet pile for trapped paint at the end of each wall to prevent smears later.

The three most common mistakes are using an oversized brush that deposits too much paint which causes drips onto the carpet, letting the blade lift off the baseboard so the carpet is exposed, and working too slowly so paint pools and migrates under the knife. Fix oversized brush issues by switching to a narrower angled sash brush and loading it lightly so paint spreads smoothly without dripping. Prevent the blade from lifting by keeping steady pressure against the baseboard with your non dominant hand and moving at a controlled, even pace rather than rushing. Avoid working too slowly by planning your sections in advance, keeping a wet edge by completing short continuous runs, and using a fast drying trim formula that reduces the window for seepage.

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