CARC Shelf Life Extension.

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 MIL-P-23337). (3) Application. Pigments of Component A have a tendency to settle. Stirring for 20 minutes is necessary to disperse these solids into a smooth, uniform solution prior to the addition of a catalyst. The catalyst, Component B, must be clear. Thickening or gelling with the presence of crystals indicates that the catalyst is not usable. M IL-C-22750 should be mixed in accordance with manufacturer's instructions. The mixed components shall stand for an induction time specified by the manufacturer before using. This coating can be thinned, if necessary, by using MIL-T-81772, Type II. For adequate resistance properties, the coating should be applied to a minimum dry film thickness of .0018 inch (.0048 cm). Mixed coating must be used within the pot life specified by the manufacturer, and cannot be stored. Component B is water sensitive and caution must be taken to insure water or high humidity does not come in contact with the coating before it is cured. (4) Drying Time. At 70"F (21"C) and above, MIL-C-22750 will dry within the specification requirements (sets to touch in approximately 20 minutes, dries hard in 90 minutes, dries through in 4 hours, with a complete cure within 7 days). 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 Neither component of MIL-C-22750 is compatible with the single component MIL-C- 53039, and should never be mixed with it. CAUTION Spray lines used for epoxy should not be used with polyurethanes without complete flushing or cleaning with solvents. NOTE CARC application requires extremely clean surfaces. Prior to painting, check cleanliness with the red litmus or water break tests. e. CARC Shelf Life Extension. (1) To determine if the shelf life of CARC can be extended, perform the following inspections: (a) Condition in container - should be no excessive skinning, hard settling or resin separation. (b) Viscosity - should be no excessive increase in viscosity from specification requirements. (c) Drying time - should conform to specification. (d) Application - should conform to specification label instructions. (e) Thinning - should thin adequately with designated thinners. (f) Gloss - should conform to specification requirements. Change 3 2-13