本规范涵盖两种主要用于喷涂的双组分环氧、耐化学和耐溶剂底漆。这些涂料与环氧树脂和聚氨酯面漆相容。本规范中涵盖的涂层通常用于商用和通用航空飞机的金属表面，禁止使用铬酸盐，但不限于此类应用。

This specification covers two types of two-component, epoxy, chemical and solvent resistant primer coatings formulated primarily for spray application. These coatings are compatible with epoxy and polyurethane topcoats.Coatings covered in this specification have typically been used on metal surfaces of commercial and general aviation aircraft where chromates are prohibited but usage is not limited to such applications.