The use of zinc chromate primers on aluminum parts is a excellent
alternative to anodising, providing proper procedures are followed. First
of all not all zinc based primers are self etching. Second, were you using
automotive products, you need to inform your retailer exactly what you plan
to do with the product. Bear in mind that all self etch products are
activated with some form of acid, and contact with water will deactivate
the etching properties of the primer. So if moisture contact is unavoidable
you should topcoat the primer with enamel/urethane paint. In most cases in
the Europa a spray can of Krylon or similar will suffice. Also if you are
acid etching aluminum parts and then etch priming them, you are doing the
same procedure twice, and could get adhesion problems down the road. As I
work for a automotive refinish supplier in the U.S., and refinished
vehicles for 14 years, I have some knowledge of these products. If anyone
has questions primers or topcoats, e-mail at jim_thursby@simphonics.com
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