What is PVA? In a message dated 11/23/2010 8:04:39 P.M. Pacific Standard Time, l...@vandyke5.com writes:
Sorry PVA. I hate this iPhone sometimes On Nov 23, 2010, at 8:57 PM, Lee Van Dyke <l...@vandyke5.com> wrote: > If you know that you will have to sand V/E you can spray pcs on the > area that you layed up, it will help form a "crust" if you will. Then > sand easy peasy lemon squeezie ++++++++++++++++++++++++++++++++++++++++++++++ PVA is Poly Vinyl Alcohol. It is sometimes used as a mold release agent so that molded parts won't stick to the mold surface. The PVA is water soluable and will easily wash off the part. The PVA will absorb some of the wax film that would otherwise form on the surface of the part during the curing of the wet layup. Resin manufacturers put the wax in the resin (both Epoxy and Vinyl Ester) to keep the curing resin from absorbing moisture from the air. The absorbed moisture would interfere with the curing process. Another easy method to get the surface wax film off the cured part is to wipe with MEK (Methal Ethyl Ketone). Don't use Acetone; it is too aggresive, evaporates too fast and will leave it's own residue. Then you have to wipe the Acetone residue off with MEK. Have plenty of ventilation AND do wear protective gloves when handling all of these toxic chemicals. Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net
