photo blocker

does anybody know much about photo blocker and spray and if it works

I would'nt like to test it out, i would say alot of it is just a gimmic, but there is probably a couple that have some effect, i seen an episode of road wars and cops were driving behind a car and noticed the plate could'nt be read on there camera but they could read it, needless to say they pulled him over, there is a product called vail which helps reduce the reflectivity of your lights and plate which cops with radar guns use to get a reading from, im looking into either the valintine 1 radar and laser detector or the belltronics rx65, i am not sure what band the new vans are using but its more than likely radar ka or ku band, but theres alot of options and reviews so alot of reading before choosing what to go for is best, check youtube also
http://www.radartest.com/article.asp?articleid=9090

while over at santa pod this year they were selling plates which looked like the background was done in reflector
strip , and when the camera flashed it could not read the no,