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i know that for some model of boats, they make a metal runner.that would go on the bottom hull of the boat. it would protect the "v" portion that is constantly making contact when you beach the boat.
I have used a product called, Marine Tex, on my livingston. its a 2 part epoxy set up that you can use underwater also. when cured it sand just like anything else. you can also just fiberglass over it and then gel coat it. the gel coat is the expensive part.