Metal corner bead is used for mudding around outside corners
After the walls in a room have been covered with drywall, they are ready to be taped and mudded. Professionals use paper tape for flat seams and inside corners, but for outside corners they use metal corner bead, which they nail or screw to the drywall and the studs behind. This metal beading provides a durable corner, but occasionally it can lift, causing the mud to crumble. To fix it, you need to re-attach the beading and then mud over it.
Instructions
1. Scrape away all the loose, chipping mud from the damaged part of the corner beading with a drywall blade. Use your hand or the blade to brush away any that is lodged behind parts of the beading that are lifting.
2. Drive drywall screws into the beading wherever it is lifting. Use enough force so that the heads of the screws sink just past the surface of the wall and make an indentation in the metal.
3. Spread mud over the beading and the wall next to it, covering all repairs and any other areas where mud has chipped away. Scrape the blade flat against the wall and the corner of the beading so that the mud is level with both. Let it dry overnight.
4. Apply another layer of mud over the first coat, and use the blade to feather this coat into the wall, forming a continuous surface. Let it dry overnight, and then topcoat with a third layer.
5. Lightly sand the repairs, and then cover them with drywall primer in preparation for touch-up painting.
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