Painting aluminium

Just need advise on a cheap primer, I don't really want to go down the expensive etching stuff route unless I can't avoid it

It's for a race car but still needs to look OK (a couple of coats polished, not 17 coats flatted, polished, hand glazed, and carnuba waxed), top coat will be a flat colour, probably standard 2 pack

Cheers

Ben

Thanks Pigeon

Cheap was really what I was after, as I can forsee a few re-painting incidents

Did you mean just bung an expoxy top coat straight on the ally or what (that would be fine for the level of finish I need)