Step 7: Use Nails to Brace Long Runs

on long runs, place a nail under the molding every few feet and at joints to hold it in place
Photo: Kolin Smith
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Along straight runs, push the straight-cut ends to create a butt joint. On long runs, place an 8d nail under the molding every few feet and at joints to hold it in place. Angle the nails up slightly to hide the holes, and sink them enough to keep them in place.
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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