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OD Green Chromate on aluminium

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  • OD Green Chromate on aluminium

    Can the OD Chromate (ODK27) be used straight on aluminium, or does the aluminum have to be zinc plated first? I see there is an aluminum chromate, but I can't determine if these are similar concoctions.

    Also, which offer the best corrosion protection? I'd assume the plated then chromated piece would withstand the elements better.
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