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Making a few guesses here... Does it flex a bit when you push on it with your thumb? If it's flexible material then it could be Sikaflex or another material designed to flex when the keel expands/contracts at a different rate than the hull due to changes in temperature.
If so, don't interfere with it, it's a pain to re-apply. Instead, get a dremmel pencil-like tool and fair it by hand by removing excess material. But don't go too close. New sikaflex won't stick to old sikaflex, so you'll end up having to strip it all the way around the keel and re-applying -- sort of like making a new O-ring around the hull-keel joint. Otherwise there will be a crack when the old and new meet which will allow water in. Then after you've made this new o-ring of sikaflex, you'll be right back where you are now, looking to fair the excess. (The stuff is hard to work with, it will look really slpoyy after you re-apply it. No surprise it looks like it does now.)
If you do cover with a hard epoxy, it may crack over the winter when the frigid temperatures makes the metal in the keel contract in size.
Like I said, some guesses in here...
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