PRIMER COATINGS, RUST-INHIBITING (TT-P664)

TM 43-0139 2-16. PRIMER COATINGS, RUST-INHIBITING (TT-P664) a. Characteristics. This is a fast-drying primer that provides a hard, smooth, satin finish on iron or steel and requires no sanding. b. Use. Use as a primer coat on bare iron or pretreated steel, or when topcoating with an enamel finish coat. This primer may also be used as an intermediate coat over synthetic enamel when nitrocellulose lacquer is applied as a topcoat. It requires no sanding prior to applying the topcat. c. Application. Apply primer by dipping, brushing, or spraying, when thinned as recommended by the manufacturer. d. Drying Time. After 25 minutes the coating is thoroughly dried. e. Thinner. Thin with synthetic enamel thinner, TT-T-306, or by the manufacturer's specified thinner. 2-17. PRIMER, LACQUER, RUST-INHIBITING (MIL-P-11414) a. Characteristics. This is a quick-drying, rust-inhibiting, cellulose nitrate primer. It is pigmented in one type and one grade only. The color is characteristic of red or brown iron oxide pigments. b. Use. Use as a base for lusterless, semigloss, and full gloss lacquer finishes in connection with automotive and general usage. See MIL-STD-171 or the desired type of finish system. c. Application. Apply primer by dipping or spraying when thinned with one part by volume of lacquer thinner, TT-T- 266. d. Drying Time. The primer will dry to full hardness in 48 hours, however it will be dry to touch in three minutes. e. Thinner. Thin lacquer with lacquer thinner, TT-T-266. 2-18. PRIMER COATING, ZINC CHROMATE, LOW MOISTURE SENSITIVITY (TT-P-1757) a. Characteristics. This primer has corrosion-inhibiting properties and is prescribed for use on materiel and equipment when severe corrosive conditions exist, such as exposure to salt water or spray. b. Use. Use on iron and steel exposed to acid and salt water spray, on aluminum or magnesium surfaces, for priming of aluminum or magnesium alloys, and on all contact surfaces with other metals or wood. c. Application. Application is by brushing or spraying. d. Drying Time. Air-dry the primer for 15 minutes before handling. It takes 24 hours of air-drying or baking for 45 minutes at 250°F (121.11°C) to dry to full hardness. Recoating may be started after 30 minutes of airdrying. e. Thinner. Thin with toluene, TT-T-548, or synthetic enamel thinner, TT-T-306. 2-19. PRIMER COATING, WATER REDUCIBLE, EPOXY, ESTER-LATEX TYPE, LEAD AND CHROMATE FREE (MIL- P-53032) a. Characteristics. This primer is a water reducible, air-drying, epoxy, ester-latex, resin base system that is lead and chromate free and meets air pollution requirements for solvent emission. b. Use. It is intended for use on pretreated ferrous metals, pretreated aluminum, and wood. It is intended for use on the inside of potable water tanks for marine use, for steel exposed to long-term weathering, or as a lacquer-resistant primer. 2-7