Did People Tint Windows in mid - late 70s?

I recall tinting film being available from the mid-70's. The first job I did was with silver reflective film. At night, with no lights on in the car, the stuff was nearly opaque. Stuff used to make the police nervous (rightly so). It did take a huge load of heat off the wagon in the summer.

By the time I did my second wagon in 1983, laws were on the books that specified how opaque the tint could be. Reflective tint was verboten in Wisconsin by then.

I think Gila Window Films was the manufacturer of both products I used. They are still in business. The film goes on like an adhesive decal. If you decide to go with film, do not use cleaners with ammonia. Ammonia dissolves the glue and creates bubbles you can never get out.