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How do i fix a leaky alum boat? - alum boats for sale

I have a small boat alum, by 8 'and has a flight bounce back in time on the rocks during a storm. The city has many small bumps in it. I'm not sure where the leaks, and if I think I found the leak, I can, I ask myself what is a good way to put a boat alum. Note: It has rivets on the seams. Thanks