My chain had surface rust, enough to make a mess of the deck but little link corrosion as far as I could see. It is 5/16 BBB. I was going to replace with longer G4 chain, but getting a drum of new chain to the slip, or anywhere else convenient, was going to be a big PITA.
So I end-for-end the existing chain. The bitter end had a fairly good amount of galvanising left. Prior to putting it back in the locker I ran it through a bath of phosphoric acid and when dry painted the whole lot in 10 m increments.
I'm hoping to avoid rust until next year's haulout when I'll be able to drive a drum of new chain up under the bow for hauling aboard.
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Brian
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