This paint is a two-component, filled poly -urethane paint system. When properly applied, it provides superior abrasion resistance, chafe and erosion resistance, toughness, flexibility, gloss, and color retention. It is applied primarily to the leading edges of aircraft.

The Du Pont Teflon filled polyurethane paint is prepared by thoroughly mixing each of the components separately. The base component (pigmented) should be mixed with a mechanical paint shaker for 30 minutes. Before you add the hardener, the pigmented base should be strained through a wire screen (No. 18 testing sieve). Be sure you crush the lumps with a mixing stick. One part 10-C-170 hardener (clear) is then slowly added to 1 part 4X203 base component. Stir constantly. Immediately after you add the hardener, add MIL-T-81772 thinner as necessary to achieve a viscosity of 20 to 25 seconds with a No. 2 Zahn cup. The pot life of the mixed material is 2 hours at a room temperature of 70F to 75F (21.1C to 23.9C). Do not use the mixed material over 2 hours after catalyst addition. Just prior to priming, you should wipe the area with a lint-free cloth and MIL-T-8 1772 thinner. Use the "two-rag" technique. Wipe with a solvent-laden rag and immediately follow it with a dry rag. The use of a dry tack rag for removing lint is permissible. This solvent wipe should not be considered as part of the primer application for the purpose of time-after-chemical treatment.

After the surfaces have been prepared, you should apply the epoxy primer. Do not attempt to apply a heavy or full-hiding coat. The proper thickness (dry film of 0.6 to 0.9 mil) is obtained at the point where the film is wet but retains a translucent appearance. You should allow the epoxy primer to air dry for a minimum of 2 hours.

After the primer has cured, apply the first coat of Du Pont Teflon filled polyurethane paint as a thin wet coat approximately 0.6 of an inch thick (tack coat). Do not dry mist or flood the first coat. Allow a minimum of 30 minutes for the solvent to flash off the first coat, and then apply a full wet coat (1.5 to 2.0 mils). Allow an additional 30 minutes to cure. Repeat the application process until a topcoat dry film thickness of 5 to 6 mils is obtained. Allow the complete system to cure overnight. The full cure takes 7 to 10 days at 70F to 75F (21.1C to 23.9C).

Epoxy-polyamide is an alternate material for aliphatic polyurethane. The epoxy-polyamide topcoat is a two-component kit. One part of the kit contains a pigmented component; the other part of the kit contains clear resin. The pigmented component and clear resin are mixed in a one-to-one ratio prior to use. The local air pollution regulations, mixing, thinning and application instructions for MIL-C-22750 epoxy-polyamide topcoat are identical to those for aliphatic polyurethane with the following exceptions: The stand time after mixing is 30 minutes, and it should be thinned with MIL-T-81772 (preferred) or MIL-T-19544 (alternate). You should allow the thinned paint to stand for a minimum of 30 minutes before it is used. The total mixing, thinning, and stand time should not exceed 1 1/2 hours. The time between coats should be about 30 minutes, and the temperature during application should not be less than 50F. The application of epoxy-polyamide is not limited by relative humidity or high temperatures.

MIL-L-19537 (gloss) and MIL-L-19538 (camouflage) acrylic nitrocellulose lacquers are the preferred topcoat materials for aircraft markings and propeller safety stripes. MIL-L-19538 is also used for paint touchup of avionic components and instruments.

You may thin MIL-L-19537 or MIL-L-19538 to a spraying viscosity by thoroughly mixing 1 part of lacquer with approximately 1 part of MIL-T-19544 thinner (preferred) or MIL-T-81772 thinner (alternate). The exact thinning ratio should be determined by the user and adjusted to the temperature, relative humidity, and spraying equipment. Acrylic nitrocellulose lacquer that has been thinned to spraying viscosity should be applied to a thickness of 1 to 2 mils. Acrylic nitrocellulose lacquer with an aerosol container may require three to four coats to cover the primer. A 5- to 10-minute air-drying interval should be allowed between coats. Apply only the minimum thickness required to cover the primer coat and allow 1 hour to dry.