Epoxy is probably your best choice. It dries hard and extremely durable. And yes it looks like plastic, can be smooth and clear as glass, and is impervious to any feces, and urates.
If you have'nt assembled your cage, you can line it with fiberglass panels, if you can use a router.
As far as paint, I have never painted an enclosure. I usually stain, and either line them, use epoxy or polyurenthane.
Just remember to let it offgas for a good long time!

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