I would think engine paint would work OK.
I recently painted my truck's tailpipe tip w/ POR15 (it had an ugly, rust-colored-but-not-rusted patina). Seems to be holding up OK. POR may make a flat black (mine is somewhat glossy).
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Jerome Welte
'97 Spec Boxster
'20 Nissan Titan XD
'02 BMW 330i convertible
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