Drying Time.

TM 43-0139 (2) Use. CARC is intended for use over new or previously painted surfaces. It is applied over pretreated surfaces after priming with an epoxy primer (MIL-P-53022, MIL-P-53030, or M IL-P-23377). CARC can be applied over thoroughly prepared existing CARC surfaces. It cannot be applied over lacquer. MIL-C-46168 is for exterior surfaces and interior surfaces routinely exposed to the outside (i.e., door ramps, hatches, etc.). (3) Application. Pigments of Component A have a tendency to settle and cake due to the solids content. These solids must be dispersed into a smooth, uniform solution prior to the addition of the catalyst. This can best be accomplished by mechanically agitating or stirring Component A for 30 minutes before mixing. The catalyst, Component B, must be a clear to pale yellow liquid and must be free of crystals. A cloudy, milky, or crystalline gel indicates that the catalyst is contaminated and should not be used. If the container for Component B is swollen, do not open it. Dispose of it as a hazardous waste. Both components should always be measured because accuracy is very important. MIL-C-46168 should be mixed four parts by volume of Component A with one part by volume of Component B. Thinning should not be necessary for brush application. MIL-C-46168 can be thinned for spraying by mixing up to one part by volume of the applicable solvent with four parts by volume of the mixed coating. The applicable solvent for Type II and Type IV is MIL-T- 81772, Type I. For adequate camouflage properties, it is necessary to apply the coating to a minimum dry film thickness of .0018 inch (.0046 cm). Under certain temperature and humidity conditions, for more even results, it may be advisable to apply two coats of a minimum thickness of .0009 inches (.0023 cm) each. Component B is water sensitive and caution must be taken to ensure water or high humidity does not come in contact with the coating. Mixed coating must be used within eight hours and cannot be stored. Once opened, component B must be used that day or stored in a sealed dry air/airless container. (4) Drying Time. Curing time increases with lower temperature or higher humidity. At temperatures of 70 F (21°C) and above, MIL-C-46168 will dry within the specification requirements (set to touch in approximately 15 minutes, dries hard in 90 minutes, dries through in 4 hours, with a complete cure within 7 days). At 60°F (16°C), MIL-C-46168 requires twice as long to cure. CAUTION Do not mix components of MIL-C-46168 with MIL-C-53039. CAUTION Components of different colors are not interchangeable. Component A of one color may not be used with Component B of another color. Components from different manufacturers may not be mixed. CAUTION Do not use CARC on items which are flexible. Because of its rigidity, the finish may crack when item is bent. CAUTION Spray lines used with epoxy should not be used with polyurethanes without complete flushing or cleaning with solvents. NOTE CARC application requires extremely clean surface preparation. Prior to painting, check cleanliness with the red litmus or water break tests. Change 3 2-11