Yes, I use it all the time on my homemade bongs. To this day I haven't found a better substance that does the job.

And as for brass pipes, I've been smoking out of those for years, and never heard they are bad. Copper is bad and I always stay away from that. However I used to smoke out of beer cans all the time. No problems with me that I'm aware of.
TheGanjaKing420 Reviewed by TheGanjaKing420 on . Silicone sealent on a bong? I made a kickass bong with my trumpet mouth piece and the hole was a bit to big... Its indoor/outdoor and heat resistant. Will this be ok? Im too poor to buy a bong ATM. Rating: 5