Hey Duston,
Paint is a two part food grade epoxy from Benjamin Moor.
I would only recommend this type of tank if you go large and cannot find a used one cheap. anything under 180g will cost you like 500 to build when you can find a used one for super cheap, sometimes free on craigslist.
unless of course you love making things in which case just go for it, I had so much fun making this thing
good luck