A cardboard ductape boat built for a competition the plans were built using autocad and then a lot of duck tape and cardboard. Average time for building a cardboard and duct tape boat is about 10 hours but our boat took about 16 hours 8 rolls of duct tape regular duct tape and gorilla tape stronger regular duct tape is enough to stop water from entering but to be extra safe gorilla tape wont hurt except it might burn a hole in your wallet. 3 4 reinforced paper tape works best over caulked edges and seams duct tape is bad it shrinks when painted clear tape is bad it melts when painted 3 4 3 layers of cardboard is plenty strong for the bottom of the boat. Cardboard duck tape boat a cardboard ductape boat built for a competition the plans were built using autocad and then a lot of duck tape and cardboard kim barr. Supplies required to build a cardboard boat 1 a sharp cutting tool 2 1 quart or more of contact cement gallon size shown 3 2 tubes or more of construction adhesive like liquid nails and a caulking gun 4 a roll of 1 masking tape 5 a roll of duct tape optional 6
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