Hi!
No reason not to use acrylic, there are plenty of custom acrylic and part acrylic cages out there. I personally prefer it because it cuts weight off of the final cage. Not much risk of scratches with no feet/claws.

A few sealants are mentioned in many threads on here, but I found that marine paint/sealant that is made for boats has worked well, I used it in an iguana cage that was high humidity and in a couple of snake cages. I can try and find the brand if you'd like.
It resists humidity and urates like crazy. I'm not sure about toxicity, but have let it cure very well in between coats and afterwards, and have never had any ill effects show themselves.

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