Questions about foam models as safe vivarium decorations
I ditched the idea of making a castle out of miniature bricks and wood and mortar, because it just made a ton more sense to build it out of EPS foam, using a wood-burning tool to melt brick / stone patterns into it and then coat it with something.
My questions are:
1) Is there good information showing that EPS foam leaches harmful chemicals into water? Supposing I were building a paludarium, for instance, would a foam structure taint the water if it were partially submerged, whether or not it was sealed all around?
2) What kind of sealant / epoxy / paint / whatever can be used on the outside of a foam structure to protect it and keep the EPS foam from contacting water?Supposing that such a substance itself does not leach into the water.
I'm just playing around with ideas here; I haven't started working with the foam yet. I just want to make sure I won't be endangering animals if I decide to decorate their enclosures a little.