A low-build sealer used as the initial application of Auto Air Colors. Has excellent coverage and adhesion to primers & prepared surfaces. Works best with a 0.5mm airbrush operated at 45+ PSI or a 1.2mm tip-sized spray gun operated at 40 PSI. Tint with 4200 Series Semi-Opaque or Transparent Colors to create a color-keyed sealer base to improve coverage of colors. The mix ratio is not specific. Mix colors approx. 25% per volume to tint sealer. Dry-sand with 600 - 800 grit paper to create a smoother surface before applying colors. Excellent adhesion direct to urethane, epoxy and lacquer primers. Excellent adhesion to existing finishes, prepare by scuffing with 600 grit. Excellent adhesion to prepared substrates; aluminum, fiber-glass, glass, wood, vinyl and ceramics. Plastics - use an adhesion promoter first. Bare, untreated metal - apply a DTM etch-primer follwed by 4001 Sealer White or 4002 Sealer Dark. Intended for application with a spray gun or large tip-sized airbrush.