"Varathane" diamond coat interior waterbourne is a sealer that is safe for reptile enclosures. That's why I mentioned that brand in particular. Not all varnishes are safe. Also, Marine paints and expoxys have come a long way and many are low VOC and safe. You can always look up the MDS for whatever product you use. As I mentioned above, looking for a paint specifically labeled "child & food area safe" should get you a safe product.
