This is a test of the fiberglass and epoxy I ordered. Its a piece of 1708 biaxial. That means a 17oz weave at 45* with an 8 oz mat behind it. Rather heavy stuff, about 1.5 lbs per square yard. But this test showed it is very tough stuff, I hammered it , poked it, and eventually stuck a 1/4 screwdriver through it, but that was hard. When I started tearing it apart, I found the puncture holes had epoxy in them from 1/4 to 3/8 in deep.