Step 1: Drill

Using a 3/16-inch masonry bit, drill a hole in the plaster about 2 inches from the crack. When you hit lath, stop—the bit won't go through wood—pull out the bit, and drill another hole about 3 inches from the first and about 2 inches from the crack. Try to hit a strip of lath with every hole you drill. (If you miss, the bit will sink in right to the chuck.

Mark such holes with a pencil as a reminder not to inject them with primer or adhesive in the next steps; try drilling again about half an inch up or down.)

Continue until there is a series of holes about 4 inches apart on both sides of the crack. Vacuum the plaster crumbs out of all the holes.
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    Tools List

    • drill
      Drill/ driver with 3⁄16-inch masonry bit

    • eye goggles
      Safety goggles

    • latex gloves
      Disposable gloves

    • caulk gun
      Caulk gun

    • putty knife
      Putty knife

    Shopping List

    1. Acrylic conditioner

    2. Adhesive (like Big Wally's Plaster Magic, used here)

    3. 2-inch plastic washer

    4. 1 5/8-inch drywall screw

    5. Joint compound