How to paint baseboards with carpeting ... shove packing tape under the edge of the baseboard. It doesn't tear easily, and it sticks the carpet down away from the wall. Run the packing tape along the edge of the carpet (we scribbled on it with pink Sharpie so it would show up better in the photos) and let it lap up onto the baseboard about 1/4 inch. With a butter knife or a flat head screwdriver, push the top edge of the tape under the baseboard. Now you're ready to paint!