Here’s where you can buy Musou Black Fabric for your own stealth projects. The vendor is called, of course, “The Black Market”.
Absorption is said to be 99.9% in the visible light spectrum for vertical incidence, but no claims are made for absorption of infrared light. For infrared applications, the manufacturer recommends their IR Flock Sheet.
This is all well and good, but it fails to answer THE crucial question - ?does it affect police “radar” or laser. If it does, well, then, boys and girls, we have a totally new “player” in the games! I would consider then buying a white car and wrapping it. Nothing like flying past the cop cruiser doing 130 and no reading on his radar!
This stuff would almost certainly have no affect on radar. It is just a fabric, and radar would pass right through and reflect off the metal body. If the car’s body was fibreglass or some other composite, you’d still get enough of a reflection off the frame and/or engine block for the radar to work (otherwise, Corvettes would be even more popular than they are).
Police laser speed guns probably use infrared, which the fabric’s manufacturer says it does not absorb. However, they do have another product specifically for infrared.
In 2004, Mythbusters tried a variety of ways to beat police speed radar—here are the (disappointing) results.
I’ve often thought the best trick to play on the Road Nazis is to fly an airplane with the B-47 anti-radar package installed. That scanned preset segments of bandwidth where one expected the enemy radar to be, and when it detected a signal for more than something like .01 microseconds, it locked to that frequency and sent back a 1,000 watt blast. Don’t think cop radar would be shielded against such an attack.
So at random times you would fly over those parts of a city where the Road Nazis would be collecting the township budget and force them to replace all those radar guns. 