Price - $30
The Basics
PhotoBlocker Spray is a simple concept. Spray a coat of clear, but highly reflective chemical on your license plate. When a traffic camera, red light camera, or speed trap camera takes a picture of your car, its flash reflects off the spray on your plate, making your license plate illegible, therefore making it impossible to get a ticket. Sounds pretty neat. I decided to buy the spray and give it a test.
How I Tested It
Obviously I wasn't going to spray it on and intentionally run red lights to see if I'd get tickets. So what I did is spray PhotoBlocker Spray on my license plate, then took pictures with a digital camera and flash to see if my license plate really became illegible.
Pro's
PhotoBlocker Spray really works. It took me about 3-4 thick coats of spray before it started working well, but once it did I couldn't read a single picture that I took. One can was actually enough for about 2 or 3 license plates, so you don't have to buy one for every car. The $30 that it costed for a can seemed to be a fair price to me.
Con's
PhotoBlocker Spray did have a couple of drawbacks. If you hold a heavily sprayed license plate at the right angle in bright sunlight then it puts off a lot of glare. The law says that license plates have to be visible to the naked eye. If the sun is bright enough and if a cop is standing at the right angle, then it could possibly cost you a ticket. Kind of far fetched, buy I think it's possible.
Overview
I'd recommend PhotoBlocker Spray to anyone who wants to feel safe from faulty red light, speed trap, and traffic cameras. I don't believe that it should be used irresponsibly (don't buy it as an excuse to run red lights), but it could save someone a lot of grief.