Plaster guns are air-powered devices that allow a craftsman to plaster walls and ceilings. Air plasters, as they are called, are useful in a number of ways, including: dry-wall plastering, indoor mold removal, ceiling finishing, painting plastering, stripping and general contractor work. There are a couple of ways in which air plaster guns can be used for their intended purposes. The first way is to spray the wall surface with an air nozzle. This results in a thick, wet plaster that is easy to spread along the wall surface, while avoiding a "clean plaster" appearance.