How to Remove Curved Ceiling Corners

Cut into the inside corner fillet with the utility knife near a corner of the room. Scrape or cut away the drywall joint compound to expose the edges of the fillet on the wall and on the ceiling.

Cut along the edge of the fillet on the ceiling and wall to minimize damage when you remove the fillet. Cut just deep enough to score the paper that covers the drywall. Push the putty knife behind the fillet and pry it away from the wall and ceiling. Use a pry bar if necessary and pull it off. Brush away any loose debris from the wall-to-ceiling joint.

Apply drywall joint compound along the wall-to-ceiling joint with a 6-inch taping knife on both the wall and the ceiling in a smooth, 1/4-inch-deep layer. Cut a piece of drywall tape that is as long as the joint and fold it lengthwise along the preformed crease.

Put the tape along the seam, with half of the tape on the ceiling and the other half on the wall. The crease should fit into the juncture of the wall and the ceiling. Press the tape into the mud with the drywall knife. Apply a second layer of compound over the top of the tape and smooth the compound with the knife to remove excess compound. Let the drywall compound set up overnight.

Sand the joint with a medium-grit sanding screen on the drywall sanding tool to smooth the joint. Wipe the dust away and apply a another coat of compound over the joint with an 8-inch taping knife. Smooth the edges of the compound as thin as possible. Let the compound set up overnight, sand it smooth again and apply a final coat with a 10-inch taping knife.

Sand the joint with a fine-grit sanding screen. Smooth the edges until you can't feel where the compound ends and the painted wall or ceiling begins. Vacuum the dust off the wall before priming and painting.