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A water soluble, film forming coating useful as a barrier coat on certain rubber molds such as Poly-Fast 72-40 to allow resins to be cast in them without sticky surfaces. While Poly 74, 70 and 71 Series molds do not cause sticky surfaces on resin castings, PVA may be used as a barrier coat in some cases to prevent resin attack on the mold. Also may be useful as a removable sealer for porous surfaces alone or in conjunction with paste wax. The green film of PVA can be washed off with water. Available in clear or green colors. The green may stain some porous surfaces.