At wall-to-baseboard joints, masking tape can protect the area that should remain unpainted. Old paint, fresh paint and delicate finishes differ in strength, so test a small area first.
Prepare the joint
Remove dust appropriately and align tape along the baseboard. Press the paint-facing edge carefully; overstretched tape or incomplete contact can increase the risk of paint bleed.
Inspect after painting
Follow paint and tape manufacturer advice on drying and removal. Lift tape slowly and watch for paint or finish lifting with it. Stop and consult a surface specialist if a problem appears.