Note: The following assumes you found the leak(s). This doesn’t require the repair patch.

1. Buy Marine Goop. Home Depot didn’t have Marine Goop, but All Purpose seemed to work fine for me. It costs about $3.
2. Get the cheapest piece of sandpaper. Borrow, if possible, because you won’t use it too long. I just bought a small reusable block. Oh well.
3. Roughen the area of the tear.
4. Apply a generous amount of the goop. I’d say 1 cm thick, and ensure the surface area covers a few centimeters wider than the tear.
5. Let it sit and cure for 48 hours.

Okay, I tricked you — it actually took a minute or two to apply the goop. I’m not sure how long this will hold up, but I’ll let you know. For now, it looks promising! Also, if I have to do this again, I’ve got a lot of goop left, it’s not even funny.

Source: DoItYourself.com Forums