BUT, with enamel…you must counter-enamel

[katkramer]

Even though you can fuse glass to copper by enameling…you usually must put a counter-enamel layer on the back side of the copper to counteract the forces of the enamel on the front.  Additionally, enamel is a very thin layer…if you were fusing a 1/8″ piece of glass (but I’m guessing it would be thicker than that!) to copper, it would most likely just break off once it cools because it is so thick and because of the expansion and contraction issues.  You’ll also have issues with firescale on the backside of the copper.

I agree that the glue-on solution is probably the best…

Kat
http://www.glasskatz.com