It's really hard to weld those aluminum pontoons correctly. They are very thin. Is the hole above the water line? IF so, the 3m sealnt will work, or try cheaper alternatives first. I've used some plumbers silicone around some small leaks on some welds. If you end up getting plates welded on, have the welder drill and tap some holes for drains in each pontoon chanber...once they start leaking it's hard to get them to stop. Good luck. Don't let your friend use JB weld...if he does , it will be near impossible to weld in that area.
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