on the other side of the coin… I’ve been looking at doing a multi substrate - varibable polarizing clear plastic lic. cover… turn a dial and whammo instand black… turn it back… 100% clear…
polarized plates do thier job but the problem is they are not controll able… the min a cop passes by at the right angle and sees a blacked out plate your done. … with a ‘polarizing substrate’ an electric current controls the on/off state so thier can be no bad angle ( when it’s unpowered… it looks like a noramal plastic clear cover…