If anybody was wondering what a good sealing agent is... I use JB Weld. it is used for holding metal pieces together, acctually i just used it for my bong made from a 2 1/2 foot graduated cylider from my school science lab haha. you can find JB Weld at your local hardware store for like 2 bucks i think<----not sure cuz i bought mine like 3 years ago. last forever. Peace all