I actually do sculpture and have wanted to fuse glass for some time, I even have a store of glass ready but am unsure how to proceed. I thought I would bisque and glaze first, as this temperature has to be a lot higher than glass fuses at, then add the glass and just refire to melt stage (about 800c - I'm from Australia), but now realise it may not adhere to glazed clay. Does it run when you heat it up, or just become jelly-like. Maybe I have to only place it in crevaces. Also, if I crush it and apply it, does it become razorsharp, or just rough? appreciate any help you can give.