What Is Hot Joint Compound

Powdered. Powdered drywall mud, also called “setting mud” or “hot mud,” contains chemicals that react when water is added to hasten hardening time. This type of mud tends to shrink less than all-purpose premixed mud but it begins to harden very quickly.

What is the difference between hot mud and joint compound?

The mud is not considered completely dry until it turns completely white in appearance. Unlike traditional drywall compound, it does not shrink as it dries, so it is possible to add additional coats of hot mud before it has completely dried. It is best however, not to paint over hot mud until it has completely dried.

Can hot mud be sanded?

How to use hot mud? … Keep in mind that hot mud doesn’t always provide the smoothest finish. If the consistency isn’t just right, you may end up with a bumpy or grainy surface. You can sand the imperfections or use a final layer of pre-mixed, all-purpose mud to finish things off.