I second and raise the above....go with a two pack epoxy of an industrial type.
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zinc paint, which stops galvanic problems.
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if only it was true.....
If you take the logical reason of zinc...it is as a sacrificial metal. ( more noble) It helps but it dont cure. It IS a good idea but does not replace anodes. Zinc prime (epoxy based) epoxy primary top coat (perhaps aluminium solids) polyurethane (2 part) top coat....