Laguna Pure Lube is a pure liquid (non-detergent) soap separator used as a release when casting gypsum/plaster into a plaster mold, and to prevent gypsum/plaster products from adhering to most porous surfaces. Pure Lube may be used full strength, or diluted with water. Apply with a clean sponge until foam appears, dab off excess, and repeat the process until a sheen appears.