Need an answer to how to tell if fiberglass cloth is finished for epoxy or polyester. The place where I get my kayaks clear coated has 2 big rolls (about 100 yards each) one of 50" wide 4 oz. and one of 60" wide 6 oz. He says they are just in his way and I can have them. (I will pay him something or else I would feel guilty forever). Obviously if they are finished for polyester and don't work with epoxy, they are of no use to me. But, how can one tell?

I just epoxied a piece of the 4 oz. to a scrap of plywood and it seemed to wet out OK. What should I look for? If this stuff is good, I have got a really good deal on cloth. Thanks for any help.

Grant