Epoxy primer

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A 1954 Dodge Coronet body with a fresh coat of epoxy primer.

Epoxy primer/sealer is a non-porous finish that is typically recommended as the first basecoat over bare steel. Various epoxy primers can also be applied over fiberglass, plastic, or the black iron phosphate coating that remains after "converting" rust.

Epoxy primer is a two-part mix, with a hardener that has to be added before spraying.

1 Body filler and epoxy primer
2 Spray (rattle) can epoxy primer
3 Tech sheets of epoxy primers recommended for automotive use

[edit] Body filler and epoxy primer

Body filler and high-build primers can be used on top of epoxy primer. Although body filler is commonly applied to bare metal, applying epoxy primer before the filler adds adhesion, corrosion protection, and durability. Body filler is thought to be best applied over epoxy primer within the primer's recoat window time.

Commercial body shops may not use epoxy primer under body filler because it's not cost-effective. However, some car manufacturers specifically require epoxy primer to be used under body filler for certain applications.

[edit] Spray (rattle) can epoxy primer

Because epoxy primer must be mixed prior to spraying, it hasn't conventionally been available in a spray can. However, "aerosol 2-component epoxy primer" has recently been introduced by Rubber-Seal. To release the activator into the primer, a plunger is inserted into a stem on the bottom of the spray can. Product literature states a pot life of four days.