For lead keel repair I think I'd just "clean" it very aggressively with an angle grinder and a new, very coarse disk, then immediately paint it with unfilled epoxy. While that is curing to its "B" stage, mix up a very stiff batch of epoxy filled with fumed silica and chopped glass. Fill it when the first coat is gelled/tacky. if its a huge crater, i might take two layers, (and a real good look for structural damage elsewhere) apply the second while the first is at its B stage. To finish that you could lay light glass cloth or better, just peel-ply on top while still pliable/wet and fair it pretty well with a plastic squeegee. I've never seen the aft edge of a keel fail. In the absence of an issues, I'm not sure I'd worry about that. My 33ii has a very thin trailing edge, still intact after 30 years. Dave
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