Alright thanks for the replies everyone

It's for my tegu and my boa. The tanks they are in now don't hold humidity and don't have the proper wood so it looks like it's slowly falling apart. I don't want mold in it or for it to rot so I want to start building something before that happens.
So for an enclosure that will have almost a foot of soil constantly in there, and 80% humidity, I'd use an epoxy resin, right? Can anyone recommend a good brand?