Step 4: Install the Molding

spread a bead of joint compound the length of the molding
Photo: Kolin Smith
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The crown adheres to the wall with joint compound, but using too much will allow it to slide down the wall. As the compound sets, support long runs of molding with 8d nails.

Using a 6-inch putty knife, spread a ½-inch bead of joint compound the length of the molding along the top and bottom edges. Spread mud liberally on each cut end.
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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