How to Patch Cracks in Garage Drywall Taping
- 1). Cut away the old drywall tape. Using a sharp utility knife, make a cut parallel to the edge of the tape and about 1/4 inch wider and 2 inches longer on each end. Cut deeply enough to reach the surface of the drywall beneath the dried compound.
- 2). Peel off the damaged tape. Since it's already cracking, it may release easily from the drywall, but if portions stick, use a putty knife to pry them off gently.
- 3). Scrape away loose debris from the edges of the cut area and from the seam beneath. The tape covers a seam where two drywall panels meet. Use the edge of the putty knife to scrape in the seam.
- 4). Apply a coat of drywall compound to the seam, using the 6-inch taping knife. With the corner of the knife, scoop up about 1/2 cup of compound and press it into the seam, smoothing it as you go.
- 5). Smooth the surface of the compound by drawing the wide portion of the knife blade along the seam, pressing firmly to remove excess compound.
- 6). Cut a strip of drywall tape 2 inches shorter than the seam you're repairing and center it over the wet compound. Use the 6-inch taping knife to smooth it in place, starting in the middle, and pulling the knife evenly toward each end. Repeat until the tape is secure and no air bubbles remain.
- 7). Allow the compound to dry completely before adding a second application of compound over the tape with the 6-inch taping knife. Spread the compound on evenly.
- 8). Switch to the 10-inch taping knife and smooth out the compound even more. The wider blade allows you to spread the compound over a larger area, reducing lumps and imperfections. Use long, even strokes, holding the knife at a 45-degree angle to the wall.
- 9). Sand the seam once the compound is completely dry and put on one more application of drywall compound. As the compound dries, it shrinks a little, but by adding one or two more very thin coats of compound and sanding in between, you can create an even finish.