I put tape over the entire car when I do wholecars... take a picture... take off the tape.. it's like no one knows I ever did it... this is a way that you can never get caught..or you could put a really big sticker on a car... I also paint right over the numbers and then put tape over the painted numbers and paint over the tape on the painted numbers.. then, when my shit gets stamped and the tape falls off of the car, it will have to be stamped again..