-- Last Updated: Dec-15-12 4:48 PM EST --
I've seen a guy wailing on a skin boat with a screwdriver
and it simply would not puncture the boat, it bounced.
A nylon fabric properly bonded with waterproof sealant
is amazingly tough and puncture resistant.
http://youtu.be/0JTcMMkgk2Y
http://youtu.be/3Xb_21OLjHE