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Painting sheet metal

Painting sheet metal

Painting sheet metal

(OP)
I have a flat-ish piece of sheet metal of the type used for air vents.  It is uniformly gray, no obvious galvanizing coating.  I have some Rust Control black enamel paint which "stops rust without a primer."  My metal piece is brand new and has no rust.  It isn't going to be handled much, but may occasionally be curled and uncurled a bit to fit the tubing before and after it, and clamps will be tightened on it.  Should I really use a primer before I paint to keep the paint from peeling off the smooth metal when it is flexed or scratched?

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