Waterproofing terracotta

[guyabano]

Hey guys, I got these terracotta dishes dirt cheap at a feed store near my residence and I wanted to waterproof them for my snake enclosures. As it is now, they soak through and eventually get the substrate around them damp. Good for humidity I guess, but I've already got way too much of that living in a tropical country. I have some enamel from a previous project, can I use that? I'm open to suggestions.