When performing cosmetic repairs, we like to get to the core of the problem. We remove any materials that won’t allow good bonding when taping with new drywall mud. All loose areas are secured by fastening with drywall screws first. We often encounter outside corners with vertical cracking. This is a result of poor corner bead installation. I chisel off all old materials and re-secure beads with nails every 12-14 inches. Then we re-mud the beads.