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Although their applications are very similar, no drywall compound and spackle are not the same thing. Spackle is a bit thicker and is used to patch holes as it dries quickly and is easy to sand. Joint compound shrinks a bit more and can be more temperamental to spread. However, one benefit is that you can use joint compound as spackle (for small jobs), but you can’t use spackle as joint compound.  

Costs range from $200 to $800, depending on the area size and damage severity.

You can plaster over an old plaster ceiling if the existing plaster is in good condition. Ensure the surface is clean, free of loose material, and roughened slightly to promote adhesion. Applying a bonding agent or primer can further enhance adhesion. Proper preparation ensures a smooth and long-lasting plaster finish.

You can drywall over plaster, but there are some things to consider. First, installing drywall over plaster will increase the wall’s thickness. This could create challenges for window and door frames that no longer fit the wall’s thickness. You may also have to adjust power outlets so they are accessible. When done right, drywall can create a smooth, flat appearance, but it’s best when handled by professionals.