[HayZee518]

sheetrock is two pieces of cardboard bonded to a plaster of paris middle which is heated to dry it. plaster is made up of gypsum and sintered limestone with binders. a real sloppy undercoat may release or expand the first layer of cardboard on sheetrock. bare plaster exposed to air and moisture creates hot spots called efflourescence which inhibits the bonding of paint primers. the efflourescence has to be neutralized by a chemical means - tri sodium phosphate is used for that purpose. two feet of standing water in a basement is not good. as the water evaporates it creates humidity in the whole house as it rises and permeates the whole house. mold developes and involves the whole structure. the whole house needs to be dried out or brought to a reasonable moisture content that can be tolerated. pretty tall order if you ask me! wvguy is our paint moderator. perhaps if you send him a private email, he may have the answers you are looking for. - hayzee