Seriously I'd recommend grey from a can of liquid galvanize in the aerosol can. I've got it on the front of the fluke of my XYZ anchor and it looks basically like I just put it on after anchoring at least a dozen times w it. It's held up really well.
Another coating that may work very well is POR-15. That is amazing stuff and it's usually black but I think there is another color??
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Eric
North Western Washington State USA
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