Should be fine. The glass isn't very porous so I doubt the sealer will even take on the glass.I put up a glass and stone mosaic backsplash in the kitchen. I was told I need to seal the stone. I bought the 511 Impregnator stuff. Is it ok if I get it on the glass tile or do I need to seal the stones individually?
it can be difficult to rub off...
do you have any leftover glass tile, or a piece of scrap? puts some sealer and on the glass as see what happens?