PVC Board 100% Water-proof?

[pet_snake_78]

A lot of the PVC I've seen is quite flimsy. I would definitely suggest being able to examine it locally or you may find it won't exactly work well with the weight of water or significant reinforcement.

[reptiledude987]

It depends how thick it is the 1/4" or thicker is pretty rigid. But I agree if its holding water and not sitting flat on the floor support would be needed.

[Tiny Boidae]

Anything that holds water needs support underneath it, even if it's plywood or acrylic. I'm not much of a fish person, but growing up I helped my dad build fish tanks all the time (it was a side hobby of his that turned a profit pretty easily), and if you didn't have support under any amount of water... Well you were asking for trouble than. At best, you'd have some bowing, and at worst you'll be mopping water and glass shards from the floor. Even if it's a reptile cage, I don't really like to build a stand without the proper support that you'd need for it if it were filled with water... Just something that's deeply rooted and makes me uneasy to look at.