Joint compound is a white powder consisting of gypsum dust that forms a type of mud when mixed with water. … On the other hand, plaster is made up of lime or a combination of gypsum powder, sand, and water. Unlike joint compound, this mixture forms a relatively thick paste.

Can I use all purpose joint compound on plaster?

All-purpose joint compound adheres well to most surfaces, so you can use it to make repairs on plaster walls. For example, if your project entails installing a small patch to repair a section of cracked plaster, you can use all-purpose joint compound for all three coats.

Can you use plaster to repair drywall?

Holes or cracks in drywall can be repaired with plaster of Paris and a few tools. Easier than patching with drywall sections or applying joint compound, plaster of Paris is virtually invisible when sanded, primed and painted.