Never heard of white metalflake. Do you mean silver?
But, here's an application guide from Metalflake. Hope it helps. Notice they are using clear acrylic, not gel coat. Gel coat is fine when it is sprayed into a mold since orange peel is not a problem. Applying gel coat as a final coat will result in an industrial grade grapefruit peel.
That is what makes repair of fiberglass metalflake gel coat so expensive.
Gel coat does not "level" like paint.
"APPLICATION GUIDE - Download Application Guide in PDF format
2. Prime with 3 coats of Primer-Surfacer. Allow 15 minutes drying time between first two coats and 45 minutes after final coat, Sand with #360 grit paper.
3. Apply 3 coats of an Automotive Acrylic lacquer Metallic col0r that matches, as closely as possible, the color of the flake being used. This will serve as a ground coat for the flake that will render any void spots from the flake coats unnoticeable.
4. Mix 4-5 ounces of Metalflake or Glowble to a quart of reduced (one-to-one) Clear Acrylic lacquer and apply 3 or more coats depending upon the degree of coverage desired, alternating spraying direction with each coat Use 2 ball bearings in cup and hand agitate constantly to keep flake in suspension. Alternate spray pattern with each coat to avoid streaking.
SPRAY PATTERN:
First coat
Second coat
Third coat
Use a Devilbiss #043 #30 or #306 nozzle or their equivalent to apply flake coats (use 25 lbs. pressure at the gun). Allow 20 minutes drying time between each coat, rub surface lightly with bare hand between each coat to flatten flakes standing on end. Blow off excess flake with air gun.
5. Final Finishing
0ption #1. Apply enough Clear Acrylic to allow for sanding without exposing the Spindrift (14-18 coats suggested.) Allow 10 minutes drying time between coats. After final coat, allow 3 weeks drying time before sanding with #220 grit sand paper using an oscillating sander until all orange peel disappears. All edges and sharp curves must be hand sanded to avoid sanding through to flake. Apply 2 more coats of Clear Acrylic. Allow to dry overnight, then wet-sand with #1000 grit paper, compound with buffing wheel and wax.
0ption #2. Apply enough Clear Acrylic to allow for sanding without exposing the flake (14-18 coats suggested) Allow 10 minutes drying time between coati. After final coat allow 3 weeks drying time before sanding with #220 grit sand paper using an oscillating sander until all orange peel disappears. All edges and sharp curves must be hand sanded to avoid sanding through to flake. Apply 3 coats of catalyzed Crysta-Crylor for "Wet Look", 3 coats of catalyzed Polygloss Clear, allowing 1 hour drying time between first two coats and 4 hours between second and third coats. Do not re-coat-can cause wrinkling and/or lifting.
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