My 1964 Old Town Otca leaks at the stern. It seems to be coming from between the stem and the keel. I have removed the stem bands but not the keel yet. Obviously, there are many screws holding the keel and the stem bands which are penetrating the canvas. I have some Dolfinite marine bedding compound. Assuming that the canvas is in good shape under the keel. Would applying this under the keel before reassembly be a good way of stopping the leak? Thank you in advance for your replies.