Review (4/5): Its okay
It takes a while for the color to come in (next day) and it does not smell very good.
The tubes are small and so are the stencils. After the first little tattoo (about 15 minutes after the first tattoo was applied) I attempted to apply one to one of my children. The goo, for lack of better word, was already hardening. If you leave it on for only 30 minutes, like it says, it is not dark at all, even the next day. But if you leave it on for an hour or more, it darkens nicely.
The finger tattoos were left on for 45 minutes to an hour each. The back of the hand was just over 30 minutes.