If a crack has developed in your drywall, it's likely a straight one, which expands and contracts at different times. Unlike plaster walls, drywall generally doesn't crack randomly on its surface, but rather the joint compound over the seams between the drywall sheets will crack. This usually means the tape under the compound has split and needs to be replaced. Retaping with flexible mesh tape (not paper) will help avoid future problems.
Instructions
1. Scrape the corner of your drywall knife forward over the crack, scraping off the plaster and exposing the drywall tape underneath. Use a razor knife to assist in getting all the plaster off, if necessary. Pull the tape off the wall, exposing the seam between the two drywall sheets.
2. Press self-adhesive mesh tape over the seam, from end to end, covering it completely.
3. Cover the tape with a line of joint compound, spreading it on with your drywall knife. Make the seam slightly wider than the tape (about 4 inches). Get it flat and smooth. Let the compound set for six to eight hours.
4. Scrape off any ridges with your drywall knife.
5. Spread on a second coat of joint compound with the drywall knife, making the seam about 6 inches wide. Let it dry.
6. Scrape off any ridges. Apply a third coat of compound, making it about 10 inches wide. Let the third coat dry.
7. Sand the third coat smooth with a drywall sander. Repaint.
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