Everyday. It depends on the strength of the anodizing solution. The stuff we have in dip tanks is much stronger than the bottles of stuff they give us to touch up spots. Basically anodizeing is acid etching the surface for the paint(primer) to grab. Put it on, wait for the metal to discolor then wash it off with clean water and dry. It could be 1 to 20 minutes to discoloration.
Epoxy primer is the hot ticket, available where they sell automotive refinishing supplies.
