"Compatible substrate primer" means either compatible epoxy primer or adhesive primer. Compatible epoxy primer is primer that is compatible with the filled elastomeric coating and is epoxy-based. The compatible substrate primer is an epoxypolyamide primer used to promote adhesion of elastomeric coatings such as impact-resistant coatings. Adhesive primer is a coating that:
inhibits corrosion and serves as a primer applied to bare metal surfaces or prior to adhesive application; or
is applied to surfaces that can be expected to contain fuel.
Fuel tank coatings are excluded from this category.
Ill. Admin. Code tit. 35, § 211.1329