I agree wih Kamaainak, acrylic paint is wonderful, just dont leave it on for more than an hour or so on the model. I experience some slight burning sensations -- but of course, I have some -pretty- interesting shots completed by a female artist that had me covered ALL in yellow (in which Im not releasing until she gives the go), but I am releasing this infamous ass photo with true yellow acrylic paint.
As for washing off; I spent an additional hour removing the paint from me and ended up destroying 5 of her towels. Of course the towels were meant for destruction, as usually women are particulary not going to have a man use really, really, good towels! Heh!
Use SOAP with LUKEWARM water and make sure the water is constantly draining. This prevents the tub from being coloured. Also, instruct the model to scoop up any leftover paint from the tub and dispense in nearby trash receptacle while washing.
Hope this helps.
