Personally, I wouldn't worry about those cracks. I have an old Ebbtide myself, 1986 17' Dynatrak closed bow w/ a 115hp tower of power, in excellent cond for it's age. Last year I kept it on a dock in the association where I live, and the water got so low that the boat was bouncing up and down on the top of a big rock underneath it without my knowledge. I went to go out on it earlier this season, and the boat took on so much water, it almost sank!! I found a big crack on the bottom of the hull, and even though the boat is in great shape for it's age, it's not worth much, so I didn't want to put thousands into it to salvage it. I found 3M Marine High Strength repair filler (46012), on line and ordered it for like $50. I put a patch of that stuff on the crack, bought a new DA, and sanded it down nice and smooth, and it completely sealed this crack. The boat doesn't leak a drop of water!! This stuff gets hard as a rock!! You can drill it, tap it, put bolts through it, whatever, it's like steel!! I would highly recommend it, and try and do it yourself. It's not that hard to use, just follow the mixing directions, and go to town!! Good luck whatever you decide.
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