I am in the middle of setting up a pier, once I am happy with it I plan to take it down and have it galvanised. You can get some pretty smooth gal coatings. That way it will be protected from corrosion inside and out. Th eonly thing I need to look in to is to ensure I won't cause any galvanic corrosion between the pier and any aluminium parts. But there should not be any current flowing to do that.
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