I think it's Ben Nye that makes a very good tattoo sealer. It comes in a tiny pot about the size of lip gloss. (I've used it to get rid of my eyebrows on some theatre costumes.)
So... just hunt for some theatre store that sells Ben Nye and you're all good. (My guess is that Mehron, another theatre makeup supplier, has some equivalent product, but I haven't used it.)
Clothes make the man.
Naked people have little or no influence in society.