Partall Coverall Film is the low-VOC, non-hazardous PVA barrier film.

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 vary depending on equipment used). Normal spraying distance is 12 - 18 inches from mold - Partall^® Coverall Film should atomize prior to contact with surface.

New Molds: Apply Partall^® Coverall Film to form a solid, integrated surface without runs or sags. Film will turn white when sprayed but should dry to a clear coat within 10 minutes. Spray until just before film begins to run. Repeat application after initial coat has dried. Second coat must also be completely dry before proceeding.

Seasoned Molds: Apply one coat in manner described above and allow to dry completely before proceeding.

Dry film thickness must be at least 2 - 4 mils on new or reconditioned molds and 1 - 2 mils on seasoned molds (2 mils is the approximate thickness of an industrial-type trash bag). One gallon will cover about 500 square feet.

Drying time per coat is approximately 30 - 60 minutes (depending on thickness) with normal application. External factors such as humidity, proximity to sunlight, and the use of fans or heaters can cause drying time to vary. Film must be completely dry before proceeding with molding. Applying additional coats before a previous coat has dried thoroughly can compromise Partall^® Coverall Film's ability to adequately protect mold surface and prevent part from sticking. Film should be very smooth and glossy when dry - a dull film may result from insufficient spray and may contain pinholes.

REMOVING PART FROM MOLD
The best procedure for separating the part from the mold depends on the size and shape of the part. In most cases the part can be lifted from the mold after loosening around the edges. A jet of air between the part and the mold at the edge is sometimes useful.

On large curved parts it may be necessary to first tap over the surface with a rubber mallet. A very strong blast of air (or a few squirts with a CO₂ extinguisher) will free very rigid parts that cannot be flexed.

Partall^® Coverall Film will stay with the part and can be easily removed with water - spray gun can be cleaned with water also. Warm water is recommended although cold water is sufficient. Do not use solvents to remove Partall^® Coverall Film as they will not be able to dissolve film - use water only.

The information and recommendations contained in this bulletin are, to the best of our knowledge, accurate and reliable. No guarantee of their accuracy is made, however, and the products discussed are sold without warranty, express or implied and upon conditions that the purchasers shall make their own tests to determine the suitability of such products for their particular purposes and uses.