Did People Tint Windows in mid - late 70s?

Purple Haze said

Hell, I had tinted window's back in 67. It wasn't the sheet tint they have now, it was a spray on made by Cal Customs.

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Maybe ill just find me some spray on tint for that authentic look, with runs and all. LOL

Since it seems tinting started in the 70s I figure ill just go ahead and tint it. At worst ill be out the money for the tint and the time to remove it if I don't like it. Still got a while though since its at the body shop.