Quote Originally Posted by Kyle
I don't think so. Cops usually aim at the middle of the car, and I don't know how a spray could black a radio wave.
It doesn't.

A common misconception is that cops always aim at your headlights when hitting you with radar or laser. In fact the entire surface of your car reflects the waves back to the gun. In order to have a car that was undetectable to radar you would have to substantially slim down it's "cross section", (I think that's the term)

Supposedly having flat paint helps to absorb radar, but unfortunately your average windshield is like a giant laser/radar mirror, so it sort of negates the effects of a non-reflective paint job.

I would assume however, that at night cops do aim at your head lights as it's probably the most visible portion of the car.