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