Recycled Glass Bottle Goblets

I've been working with glass bottles for a while, making tumblers by cutting off the tops of bottles.

Unfortunately I underestimated the strength of the glass adhesive I used, and the goblets are not dishwasher safe nor entirely usable. I haven't found a proper resin or glue that can keep a glass intact through hot water washing, but if you have any recommendations please let me know!

This is a new venture with the same idea, taking those tops and bonding them to cut-off bottoms of bottles as well. The result is a stunning 100% recycled goblet, as seen here.

These goblets are not listed for sale, until I can find a better adhesive to use.