The coatings covered by this specification are intended for use on metal surfaces as corrosion-inhibitive, chemical-resistant, stoppable, epoxy primers that are compatible with MIL-C-85285, MIL-C-83286, MIL-C-46168 and MIL-C-53039 polyurethane topcoats and MIL-C-2Z750 epoxy topcoat. Compatibility with other topcoats should be tested prior to use. Type II primer is intended for use where low infrared reflectance is required. Class 2 and Class 3 primers are intended for use in areas where air-pollution regulations restrict the maximum VOC content of coatings. Class 3 primer shall not be used for applications where the ambient temperature could exceed 500°F or where the chlorinated solvents could become entrapped, such as faying surfaces or the wet installation of fasteners. Class 3 of either Type I or 11 is not approved for Air Force use.