Rough edges & devit
A diamond hand pad, sand paper, or a scythe stone can be used to clean up the edges. If you want to clean up the back, diamond hand pads are your best bet (or a lap grinder). Note that a certain amount of texture is inevitable on the back of fused pieces.
To avoid devit, make sure you’ve cleaned the edges of the glass really well if they were sawed or grinded (ground? ). Many people saw or grind, drop the piece in water, saw or grind the next piece, drop in water, etc. to keep the edges wet until you can clean them all thoroughly.
I have never really used devit spray. I usually try to avoid it by capping colors that are prone and cleaning the glass really, really well.
Jester’s Baubles Fused Glass Designs