Bare by The Other Brothers
How "wet" is the solution. Back in the day I had a trick very similar to this, can't remember name or where I got it, but I swear Wayne Houchin was in the video (not Stigmata). With the trick you got a little stick that looked like a glue stick, that you could write on your arm with and then, the spectator would think pick a card. Then write it on a piece of paper. You burned the paper and rubbed the ash on your arm to reveal the card. That stuff was "sticky" and you could wear it all day and it really wouldn't smudge once on. Is this the same or does it smudge really easy?