I was wondering if anyone knows what black plastic nursery pots are made of (I know it's poly-something-or-other) and what kind of glue can be used on them? I have a couple large pots I would like to make into ponds (to provide more humidity for my bromeliads- there, not my message belongs) by using pieces of pots to cover the bottom holes. I know there are lots of geniuses on here and someone has the answer! Thank y'all- Dave