i plastic dip'ed some spare rims i was going to put on and like manny said, just find a good distance, all though i didnt really care, and just sprayed away and actually came out really good. Just didnt get it covered good enough on a few rims. But goes on good and dont do it good, just peel it off.
did see a video once, where i guy just loosely tapped off around his emblem and then sprayed it, and then just slowly peeled off the excess paint around the emblem.