: I'll second that.
: All fabrics intended for encapsulation in a resin are treated with a sizing
: to make them compatible to one particular resin. That's one of the reasons
: why buying wads of cheap glass cloth off eBay is a crap shoot.

Wow! I didn't know that, guys. I'll run a test before I use it. I learn something new all the time. This glass was setting by a two-part epoxy or polyester, I didn't really look at it closely but I'm guessing it's probably OK. I have bought glass from one place and my epoxy from another without problems in the past. Maybe I was lucky.

John