I have a 13ft Aluminium Semi V boat in which the keel (the v-shaped strip riveted down the middle-bottom) has cracked, and the boat now leaks. I was wondering if anyone had any ideas to make a repair to this that will last a long time. I have a couple of ideas, but I may be overlooking something obvious. Any thoughts will be welcome. By the way, can a fiberglass patch be put on this and be expected to stay in place?