I checked a web site that sells it. This is what they said about it "Create a custom look.
VHT's Nite Shades coating is a transparent black taillight lens coating for creating a custom look. When applied to taillights, fog lights, or turn indicators, VHT Nite Shades appears black--until the lights are lit. Then the natural color appears; red, in the case of taillights. It's recommended for off-road use only, as it may not be legal in some areas."
I'm not sure if i would get pulled over for it. Looks great and good luck with it.
Bad A$$ Warrior T.V. Commercial
http://video.google.com/videoplay?docid=-9176064200880292760