you must mean don't paint a train CAR that has a piece on it already
yeah, sure, i'll go up and down the whole train and if i see a piece i'll just go home.
maybe i try to find a clean car first, but if there aren't any good ones it gets hit off to the side of a car that's already got some paint on it-- not going over whats already there of course.
remember the things have two sides to them~