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发表于 2009-3-13 08:39:01
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Partall® Coverall Film is a water-based polyvinyl alcohol (PVA) coating consisting of water-soluble, film-forming materials. It is particularly recommended as a parting agent for separation between polyester or epoxy resins and various mold surfaces. It is not recommended for use with resins containing water or giving off water during cure (i.e., phenolics) or with automotive finishes, as damage may occur. Partall® Coverall Film features – improved layout and a better finish. Low-VOC and non-hazardous is environmentally friendly and offers less worker safety issues. Designed to give best results when sprayed, but can be brushed, rolled or wiped on; higher solids content means faster dry film build up using less labor and less material resulting in a cost reduction. "More coverage for the PVA dollar!"
Partall® Coverall Film will not shrink and pull away from corners or curved surfaces. After resin has dried, the film parts easily from the mold and is readily dissolved from the molded parts with water. An occasional coating of Partall® Paste #2 is required on most mold surfaces before application of Partall® Coverall Film.
PREPARATION OF MOLD SURFACE
Porous molds (i.e., plaster or wood) must first be sealed with lacquer or similar coating. A good surface on plaster may be obtained with automobile type primer-sealers and lacquers. Plaster molds must first be thoroughly dried.
Mold surfaces should be free of other parting agents, especially those containing silicone.
Cleaning with fine steel wool or sandpaper will not affect the high gloss obtained with Partall® Coverall Film. Deep scratches or pits will fill with solution, however, and increase drying time.
APPLICATION OF PARTALL® COVERALL FILM
Partall® Coverall Film is ready to use as received and should not be diluted. Apply using a spray gun or brush, depending on desired post-production finish. When using a spray gun, adjust air pressure to approximately 60 - 90 psi at the gun (setting may |
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