did u read the link above?

  • Glitter license plate: contains 'microcrystals' to deflect the speed camera's flash.busted
  • Lenticular plastic cover: distorts the plate when viewed at from an angle. The plate remained legible, though partially distorted, for both Adam's camera and the speed camera busted
  • Plastic wrap: very legible busted
  • Commercial spray: very legible busted
  • Hair spray: very legible busted
Annotated Mythbusters: Episode 73: Beating the Speed Camera, Exploding Nitroglycerine Patches (with Defibrillators)