To repair cracked sheetrock, scrape and prime the damaged area, apply drywall tape and joint compound, prime the repaired area, and paint it. The supplies needed include a putty knife, drywall knives, primer, paint, fiberglass drywall tape, joint compound, a paint roller and a paintbrush.
- Scrape and prime the damaged area
Scrape the crack and the surrounding sheetrock with a putty knife. If the sheetrock is covered in gloss paint, cover the crack with drywall primer.
- Apply drywall tape and joint compound
Cover the crack with a strip of fiberglass drywall tape. Use a 4-inch drywall knife to spread a thin layer of joint compound over the tape. Smooth the compound with the knife, and let it dry overnight. The following morning, apply a second coat of joint compound with an 8-inch knife. When the second coat is dry, use a 10-inch drywall knife to apply a third coat. Let it dry overnight, and then inspect the repair. If the surface is not completely smooth, apply a fourth coat of joint compound.
- Prime and paint the repaired area
Use a paint roller to spread primer over the repaired area, and let it dry according to the manufacturer's instructions. Cover the dried primer with paint.