I have a client looking for static cling decals (or something thats removable that they can take off and re-use at will) to apply to the outside of a few of his vehicles (since they have tinted windows) and from everything I have found they seem to fall off all the time. I applied a small peice to the window on my truck and it didnt fall off, but this could be a "VERY GOOD" potential client so I dont want to sell him something that wont work.. He tried magnets on his doors already and had has problems with them flying off on him, I'm not sure what to tell him. Any comments?