Step 4: Apply the Scratch Coat

Apply the Scratch Coat to repair plaster
Photo: Ben Stechschulte
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In a clean bucket with cool tap water, mix Plaster Magic patching plaster to the consistency of natural peanut butter. Using a margin trowel, smear the mix against the old plaster edge, as shown, and over the lath. Keep this layer recessed by half the thickness of the original plaster. Rough up the patch by scratching it with a scarifier, then scrape any blobs off the wall.
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    Tools List

    • drill
      Drill/driver
    • 1/8-inch drill bit
      -inch drill bit
    • 3/16 masonry bit
      3/16-inch masonry bit
    • wetdry vac
      Wet/dry vac
    • caulk gun
      Caulk gun
    • cleaning rag
      Rag
    • small plastic bucket
      Mixing bucket
    • margin trowel
      Margin trowel
    • to mix and apply plaster
    • plaster trowel
      Plastering trowel
    • to spread and smooth plaster
    • notched trowel
      Scarifier
    • six-inch taping knife
      6-inch taping knife
    • grout sponge
      Sponge

    Shopping List

    Wood lath
    1-inch drywall screws
    Plaster conditionerPlaster adhesive
    Patching plaster
    Ready-mix joint compound