This standard contains requirements for three performance levels of primer coatings used to protect ferrous substrates that contain zinc as the major pigment component. Individual products meeting minimum performance requirements of this standard may vary in formulation, raw materials, and application characteristics. The specifier selects the appropriate performance level. If no Level is specified, Level II becomes the default.
SSPC-Paint 20 is a formulation-based standard for inorganic or organic zinc-pigmented coatings that includes options for specifying higher zinc loading levels in the dry coating film. An example of specification language that references both performance and composition requirements can be found in Note 9.1.

This standard does not contain requirements for weldable preconstruction primers such as SSPC-Paint 30.

This coating is intended for application by spray for use by itself or as a primer in a multi-coat system.