MIL-PRF-32643规定了阳极氧化镁基材上用作密封剂的涂层的性能要求。密封涂层不含铅和铬酸盐，符合I型和II型包装的溶剂排放量最大为3.5 lbs/gal（420 g/l）和III型包装的溶剂排放量最大为1.00 lbs/gal（120 g/l）的空气污染要求。密封涂层不含有害空气污染物（HAPs），并用于符合MIL-DTL-32459的阳极氧化。密封剂涂层与耐化学剂涂层（CARC）系统中使用的环氧底漆和面漆兼容。

MIL-PRF-32643 governs the performance requirements to be used for qualification of coatings as sealers over anodized magnesium substrates. The sealer coating is lead and chromate free and meets the air pollution requirements for solvent emissions at 3.5 lbs/gal (420 g/l) maximum as packaged for types I and II and 1.00 lbs/gal (120 g/l) maximum as packaged for type III. The sealer coatings are free of Hazardous Air Pollutants (HAPs) and are to be used over anodizing conforming to MIL-DTL-32459. The sealer coatings are compatible with the epoxy primers and topcoats that are used in the Chemical Agent Resistant Coating (CARC) System.