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 thermoset polyester, vinylester or epoxy resins and various mold or plug surfaces. It is not recommended for use with matrices containing water or giving off water during cure (i.e., phenolics).

Partall^® Coverall Film features –

improved layout and a better finish for cosmetic parts
will not shrink and pull away from corners or curved surfaces
Low-VOC
non-hazardous
environmentally friendly
offers less worker-safety issues
higher solids content means faster dry-film build-up
requires less labor and less material resulting in cost reductions

Designed to give best results when sprayed, but can be brushed, rolled or wiped on substrate with sponge or cloth.

After the laminating or casting resin has cured the PVA film releases easily from the mold but remains attached to the part. The PVA film is then peeled from the part or is washed off with water. The Partall^® Coverall PVA film is renewed for each casting cycle.

PREPARATION OF MOLD SURFACE
Plaster, gypsum and other hydrophilic molds or plugs must first be thoroughly dried and sealed. Porous substrates (i.e., plaster or wood) should first be sealed with lacquer or similar coating. Rough lumber molds may be sealed with a wax like Partall^® Paste #2.

Apply a high quality mold release wax specified for fiberglass use to the sealed mold surface. Polish mold release wax to a shine between coats. Suggested waxes. -

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, sponge, roller or cloth depending on desired post-production finish.

When using an HVLP spray gun, adjust air pressure to approximately 22 psi (1.5 bar) at the gun. 1.8 - 2.2 mm spray nozzle is preferred. Normal spraying distance is 12 - 18 inches (30 - 45 cm) from mold. Partall^® Coverall Film should atomize prior to contact with surface. Gradually build up film thickness with repeated coats allowing each coat to dry.

Apply Partall^® Coverall Film to form a solid, integrated surface without runs or sags, porosity or voids. Film will turn white when sprayed but will dry to a transparent coating. Spray until just before film begins to run. Repeat application after initial coat has dried. Second and subsequent coats must be completely dry before proceeding. New or reconditioned molds will benefit from 4 mils dry PVA film thickness (about four coats).

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).

Drying time per coat is approximately 30 - 60 minutes with normal application. External factors such as air temperature and humidity, substrate temperature and the use of fans or heaters can alter drying time. PVA film must be completely dry before proceeding with casting or molding parts or applying in-mold coatings. Film should be very smooth and glossy when dry. A dull PVA film may indicate insufficient film thickness reducing parting effectiveness.

CLEAN UP
Clean up Partall^® Coverall Film with warm water.

Partall^® Coverall Film will stay with the part and can be easily removed by peeling or with water. Warm water aids in dissolving dry PVA film.

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.