I am trying to find a recipe for the plastic or faux-rock that is used to make furniture. Exo-Terra uses a log of heavy faux-rock as seen here: Exo Terra : Products : Hide Outs and here: Exo Terra : Products : Feeding Tools While zoo-med tends to lean towards non-porous plastics or some kind, as seen here: Repti-Rock I would like to build a custom plaudarium/vivarium but I want to do it using a material that is not going to harbor bacteria and will also hold water such as a waterfall. If anyone knows a good material to use that will have a very long life, plastic or faux-rock, can be used with a mold, will not harbor bacteria, and can be used in high and low humidity, please let me know. I would greatly appreciate it. Thank you.