Depends on the surface of the material your are spraying. Did you scuff up the metal so that the plasti dip has something to hang onto? If you have a surface that is polished with a hard material like your chrome wheels, nothing will stick to it very long. Also, why do it even if it is temporary?
I scuffed up the plastic and put down a base of black wheel spray paint and then sprayed over the dry paint with the PD so it is was an even color. Then after it all dried I took the dremel to the holes and cleaned out the "overspray" and then remounted. Went on without a hitch.
Looks so much better IMHO and I don't like black wheels but for a temp solution I like it. Until I can afford to do it right.