Why does my drywall mud keep cracking?

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. Similarly, you may ask, what causes mud to crack as it dries?Mudcracks (also known as mud cracks, desiccation cracks or cracked mud) are sedimentary structures formed as muddy sediment dries and contracts. Crack formation also occurs in clay-bearing soils as a result of a reduction in water content.Secondly, do you need to 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. People also ask, how do you fix cracked drywall that keeps coming back? Before you patch, use a painter’s 5-in-1 tool to rake out the former repair materials. Then scoop out the patch and spread it on in thin layers. Wipe off any excess (you won’t be able to sand it down like joint compound), let the patch dry, then paint. This story appears in the November 2015 issue of Popular Mechanics.Should drywall joints be tight? Drywall Joints Are Too Tight Not only that, but you have to allow for expansion and contraction of the underlying framing members. Natural seasonal expansion of the wood framing can crack drywall joints that are too tight.
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