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How to Repair a Crack

  1. 1
    Using sandpaper, remove any loose debris from the cracked area.
  2. 2
    Again using sandpaper, lightly sand any raised or rough areas.
  3. 3
    Using a putty knife spread a thin layer of patching material into the cracked area. Allow it to dry.
  4. 4
    Use sandpaper to smooth the patched area and make it even with the surface. Remove any final dust or debris from the finished repair.