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I went with a Rustolem Industrial DTM Urethane Mastic topcoat that I ordered from MSC. From the specs it superior resistance to chemicals, weathering, etc, etc. I also used Rustoleum's 2-part Industrial Epoxy Primer which was recommended for galvanized metal. If I had it to do over again - I'd probably just go with their Industrial Epoxy topcoat. The Urethane stuff seems to chip a little too easily.
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