Outside corners on walls take a lot of abuse and can become dented and damaged over time. To repair damaged drywall corners: Use a hacksaw to cut through the damaged section of the metal corner bead. Score along the edge of the bead about 1¼” back from the corner. Pry the corner bead off the wall ... Nov 23, 2019 - Explore msprentice1013's board "Patching plaster walls" on Pinterest. See more ideas about Plaster walls, Plaster and Plaster repair. Plaster ceiling repairs are probably a fact of life if you have an older house. Old houses have wonderful plaster ceilings and walls, but foundations shift over time and this leads to large cracks in the plaster. Repairing these cracks can be a problem. I recently purchased a house that was built in the 1800s. Most of the house has plaster and lathe walls. The walls are all crumbling and most of the rooms have panelling covering them up. My other concern is insulating, I live in upstate New York it gets very cold, blown in insulating is not a ... Repair Plaster Walls! Repair plaster or damaged walls. Nu-Wal® is a quick and efficient system for repairing damaged plaster substrates of walls and ceilings. The Nu-Wal® system covers and reinforces the entire surface with a fine textured fiberglass mat embedded in an elastomeric adhesive.