Moisture can have a devastating effect on plaster if allowed to linger unabated in a home. As moisture seeps through a wall, it can push your plaster forward, causing a small bubble in the material known as blistering. The only effective method of removing the blister, after dealing with the moisture issue, is to remove the effected plaster and replace it with a patch. Quick to apply and to dry, joint repair compound helps you recreate the plaster surface with a paintable patch that blends in with the surrounding plaster, leaving you with the fine look of plaster that old homes are known for.
Slit the blisters open using the edge of a taping knife. Scrape the plaster covering the blister off the wall with the knife blade and scrape away any loose plaster surrounding the blister as well.