Things You'll Need
Instructions
Use some masking tape to cover the edge of the rounded corner. Firmly attach the tape parallel to the rounded corner. Apply the tape from the ceiling to the corner.
Apply paint to the wall leading up to the edge. Allow the paint to dry overnight. You can use a roller for this task.
Also using a roller, apply paint to the other side of the rounded corner. Use either the same color or a different color. Allow the paint to dry overnight.
Remove the tape from the edge of the corner. Use a brush to paint the rounded corner. Allow the paint to dry overnight.