Try clamping a piece across a frame and see if some standing water leaks through. Since Tyvek doesn't stretch I would guess that you would have to either sew or tape the seams. Sewing would involve an awful lot of work and create holes, so I guess you would have to experiment with tape. Let us know how it works out.

PaulMon
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: Hi All,
: I'm entering in a 20km kayak race but we have to build the 'kayak' with
: things we have lying about at home or friends' homes. I can get my hands
: on some tyvek. Now I wonder if anyone has any experience in skinning a SOF
: with Tyvek. What would its permeability be over 20 km. Would it have to be
: made impermeable? How? How puncture resistant would it be? Anyone?
: JohnK