How to Correct Paint Imperfections in Drywall
- 1). Sand the imperfect area heavily so the area is smooth and level with the surrounding wall. The sanding should also eliminate the imperfections.
- 2). Clean away any sanding dust with your dust rag.
- 3). Apply a coat of paint to the area. Feather the paint lightly at the edges so it blends into the existing paint job.
- 4). Apply a second and third coat as necessary.
Source...