The tint I have used in the passed has a clear layer on it that needs to be pulled off before you put it on the window. Kind of like a sticker backing. A lot of people don't know about this and thats why they have HUGE air bubbles.
Also clean the window with soapy water and a razor blade first.
It takes patience. If you are aggravated put it all away for another day.
I used to do it myself when I was in high school years ago, but the last couple of times,I took my F250 and my wife's car and spent the $100 at the tint shop.
Good luck.
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OK, I'm over it. Where's the beer?
