I've had EXCELLANT luck with 3M Pronto CA8 Instant Adhesive glue. Hold the piece together tight for about 30 sec. and then just let it sit for about 2 min. after that. I've repaired glass pipes, bongs and NEVER had problems.

You can get this at a Industrial Supply shop like Granger for about $15 for a 1oz. bottle.

Have a good one!:jointsmile: