Steps to Repairing Plaster Walls Clean dust from the holes with a wet/dry vacuum. Apply a thin coat of joint compound to the wall using the putty knife. Let the compound dry overnight, sand the surface lightly with 120-grit sandpaper, then apply a second, thinner compound coat.Click to see full answer. Subsequently, one may also ask, can joint compound be used on plaster walls?All-purpose joint compound is a building material drywall finishers use to spackle, or mud, a drywall installation. All-purpose joint compound adheres well to most surfaces, so you can use it to make repairs on plaster walls.Subsequently, question is, is patching plaster the same as joint compound? Mud and Hot Mud To make a gypsum plaster, manufacturers add cross-linking chemicals to bind the mixture. Without these hardening chemicals, the gypsum paste is called drywall joint compound, or mud — with them added, the mixture variously becomes patching compound, plaster of Paris or hot mud. Secondly, what do you use to patch plaster walls? First, apply a thin layer of plaster or joint compound and then apply the tape. Apply more plaster or joint compound mixture over the tape and use the drywall knife to smooth the surface until it’s even with the wall, pressing to remove pockets of air and plaster/drywall mud from beneath the tape.Can you patch plaster with drywall?Even though plaster walls aren’t framed to accommodate drywall, you can usually screw drywall to the wooden lath that supports the plaster. Finishing the edges of the repair with tape and joint compound makes the outlines of the patch disappear.
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