Polytek PVA Water-based Sealer (2 lbs. bottle)
Apply this water-soluble barrier coat to certain rubber molds (i.e., Poly-Fast 72-40) to allow resins to cure without sticky surfaces. While Poly 74-Series and Polygel molds do not cause sticky surfaces on resin castings, PVA may be used as a barrier coat to prevent resin attack on the mold. Can be used as a removable sealer for porous surfaces alone or in conjunction with paste wax. PVA residue washes with water.