Zinc chromite primer covered by this specification is intended for use as a corrosion inhibiting primer on metal surfaces. It may be applied by brush or spray and is suitable as an after-pickling primer for plates, as an undercoat for alkyd enamels, and for equipment where a quick drying primer is not required. Formula 84 provides a primer of yellow color. Formula 84D, a dark green version of Formula 84, is frequently used to provide color contrast when applying alternate coats for primer formula 84B is the brown after-pickling primer designated by the Navy for identifying Hy-80 high yield strength steel. This specification primer is different from material conforming to TT-P-666, which is intended only for spray application and where a fast drying primer is required.