Wentworth (how they put the tattoo on for Prison Break): It's a very lengthy process. It's the most ambitious pro tattoo ever attempted for TV or film. It takes two people four or five hours to apply. They strip moisture off the skin by applying alcohol so it adheres properly. Then a layer of glue is applied before they fix the decals with waterproof sealant on top so it stays. It's made up of a series of details that fit together like pieces of a puzzle. There are about 24 pieces to cover my entire upper body and arms. Fortunately, we only have to do it once per episode. If you don't tamper with it, it will deteriorate slightly but will last for up to two weeks. It's a bit like wearing fly-paper and it stains so you have to scrub it off at the end of the day with solvents.