I have used Alodine 1201 in the military on aircraft, and on my boat. I do NOT think it would be useful for underwater application. Just not enough protection.
What are you trying to make?
Thank you for the replies.
I need to replace the tube that the centerboard cable goes through.
It is about 8 inches into the keel and goes through the cabin up to the deck.
It's 1.5 in OD with 1/8 wall.
About 3 feet would be under water (by that, I mean saltwater will be inside the tube at all time up to the waterline).
O'Day 30 - Stuart, FL
Oceanis 411 - South of France