i painted this inlet manifold with halford own aluminium paint and laquer it has stood up to fuel spillage and heat for the last couple of years quite well so i would have though a better brand of paint would have no issues.
I have seen at least to paint manufacturer products that are clearcoat and actually designed to be used direct to metal. The datasheet said not for polished metal, bit a blasted surface should be an ideal key for them to stick well.