use some heatproof epoxy epoxy has very little fumes especially if you use the clay type of epoxy where kneed it like dough....and fyi glass does conduct heat VERY well....or else why would they have glass cookware althought glass conducts less heat then metal so...try the clay type of epoxy see if that works just sand down the outside with some fine grit sandpaper to help the shit stick clean with alcohol and your good to go