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I would first drill holes in each of the crack, to prevent further propagation. I would then align both sides of the crack and either plastic weld it back together, or use an adhesive, maybe something along the lines of what body shops use for structural bonding. You can call 3M and talk to someone on the engineering side, give them your application and have them recommend the most suitable product. I’d then mechanically rivet a piece of metal inside to reinforce it, as has been explained above. I don’t know that I would use aluminum, as it is easier to bond to other metals.
Then put a roll of flex tape in the boat.
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