1. Cut a V-notch through the full length of the crack, 1/8 to 1/4 in. deep, removing all loose wall material. Protect woodwork with masking tape.
2. Embed paper tape in joint compound using a 6-in. taping blade. To avoid trapping air bubbles under the tape, moisten the paper tape with water, lay it over the crack and squeeze excess compound and air from underneath with the blade. Apply an additional thin layer of compound and feather it off 2 in. on both sides of the tape. Let dry.
3. Apply a second (and third, if necessary) coat of compound, smoothing it out 6 to 7 in. on both sides of the joint. Smooth the compound to a thin, even coat using long, continuous strokes with a 12-in. taping blade. Allow the repair to dry thoroughly, sand it smooth (avoid exposing the tape) and paint it.
Tip: Minimize the mess when you are cutting or drilling a hole in drywall by taping a bag below the work zone to catch the dust. Using an easy-release tape to avoid wall damage.
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