Here is a prime example of a technology that DOESN'T need to be used in a car. This stuff first came around about 8 years ago and they used it in all the 'chic' bathrooms of new, prestigious clubs and lounges. You could walk in the clear, glass stall, lock the door, and BOOM...it's frosted over while you take a dump.
There is nothing safe about having this in your car when it frosts two ways (can't see in or out). The only utility is if you store diamonds on the seats of your car while it's parked or you've installed a toilet in place of the passenger seat.
