Painting onto bare zinc with Diamond Clear

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    Hi there,
    I’m trying to seal a piece of zinc jewelry so that it won’t tarnish, using Eastwood Diamond Clear. After cleaning the surface with isopropyl alchohol, I put several coats on and let it cure for several days, and that held for several months, until it came off all in one piece.

    Is there a way that I can prepare the zinc beforehand, or something, that could improve its durability?

    I’ve seen references to baking on finishes in an oven at 175-200F for an hour for a harder finish. Is this recommended?

    Thanks for the help!

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