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I built a cardboard canoe that held over 500 lbs (3 heavy people). Did not take any water. Was in the water with us 3 for a 1/2 hour. And in the water longer with just 2 people. The paddles were also cardboard and duct tape. I am also making a front bumper prototype out of cardboard and duct tape.
I will post a diy w/ pics after completion/testing.
I used duct tape to seal my boat.
Other things that would work: Shrink wrap, marine vinyl, clear packing tape, epoxy, poly
+1 for duct tape. 2 layers for front, 1 layer in back.
note: if using epoxy or poly you need to make sure the object is resistant to deformation.
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