POLYVINYL ALCOHOL (PVA)

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POLYVINYL ALCOHOL (PVA)

Traditional alcohol containing PVA with superior layout qualities, designed for spray application (also suitable for roller or sponge application), available in clear transparent form, solvent resistant yet water soluble.

Any of a number of materials applied to the mold surface before part fabrication, in order to aid in the release of the piece from the mold. These could be waxes, oils or specialty release coatings such as PVA or wax and PVA both.

PVA (Polyvinyl Alcohol) should be used with Wax to aid in the release of parts from a mold. It should be applied in three thin mist coats over nonporous, waxed mold surfaces. After the final wax coat has dried, begin by spraying a light tack coat of PVA. Typically, within few minutes the final heavier coats can be added. The PVA dries to form a smooth, glassy film. After part release, the residual film can be removed with water. We recommend using Spray Guns for larger molds, but for smaller molds, you can use roller or sponge. PVA can also be sprayed over any polyester repair to provide an airless cure.

PVA is frequently used in rigid tools where to be sure of de-mould, a secondary system is employed. Usually painted on top of buffed solid wax this can fish eye on application so care should be taken. Simply paint on and allow drying for a micro fine coating of Poly Vinyl Acetate which will not bond with GRP under any circumstance.

When using on top of buffed wax, if the product fish-eyes then use a little just off the boil water in the PVA to help it dry off that bit faster. Its also helpful to continually drag the product over the mould surface until almost dry. On the application of the third coat, the surface should be uniform, glossy and flat.