Why did my joint compound crack?

If the mud on your fresh drywall is cracking, painting over the problem only serves to make the cracks more noticeable. Drywall mud often cracks because it has dried too quickly or because the application was too thick. Instead, you can patch the cracked area once the mud has dried.Click to see full answer. Also asked, what causes drywall mud to crack?It sounds like air leakage carrying moisture is wetting the interior of the wall and causing the mud to rehydrate and crack upon drying.One may also ask, should I sand between coats of drywall mud? 2 Answers. Yes, knock off any bumps between coats, but there’s no need to get it perfect. A screen sander on the end of a pole is the best tool for this job. And it goes without saying that you should minimize any bumps while the mud is still drying to avoid having to sand it later. Subsequently, question is, how do you repair cracked drywall seams? Fill the crack with new drywall compound, and apply a thin coat of compound to the wall surface where the old tape was removed. While the compound is still wet, place a strip of fiberglass tape over the seam, bridging the gap between the ends of the existing tape (image 4).How thick can you put on joint compound?Start by laying a thick bed of joint compound down the center of the seam. Then smooth it down to a consistent thickness of about 1/8 in. with your 5- or 6-in.

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