If you can find the leaker, first try taping it a little with a hammer on each side. They are aluminum too so don't whack them too hard.
There ae at least 3 brands of two part boat repair epoxy sticks. They work even if wet. Just mix by hand into a dough and apply to the spot.
J & B is one, can't remember the others. I have carried these for years in the boat and have fixed several holes and rivits leaks. I am on some pretty shallow water with plenty of rocks.