Step 2: Cut an Inside or Outside Corner

miter cut an inside or outside corner
Photo: Kolin Smith
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To cut the molding at an angle for an inside or outside corner, place it in a miter box upside down and braced against the bottom and side of the box, as if it were angled against a ceiling and wall. Using a handsaw, cut the molding at a 45-degree angle. On an inside corner, the top part of the molding will be shorter; on an outside corner, the bottom part will be shorter.
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    Tools List

    • miterbox with saw
      Miter box with hand saw
    • putty knife
      6-inch and 1½-inch putty knives
    • rasp
      rasp or sanding block
    • hammer
      hammer
    • grout sponge
      sponge
    • angled sash paintbrush

    Shopping List

    1. Plaster-coated Foam Molding
    Get 10 percent more than you think you'll need, to accommodate offcut.

    2. Joint Compound
    Lightweight, easy-sanding premixed compound is best. A 1-gallon container will cover about 60 feet of molding.

    3. 8d Finishing Nails
    To support long runs of larger molding profiles as the compound dries. 4. 150-grit Sandpaper

    5. Painter's Tape

    6. Primer and Paint