We had it tinted windows for 10 yrs in our old house and now 2 yrs here. It cut our a/c bill drastically. We also put in on our BR windows and unless lights are on, neighbors can no longer see in. I'm not sure it was 3m though as I filed away the documents. There is a man who lives in TV that installs it and is more reasonable and very knowledgeable. He gives a 5 yr warranty If anything happens to the film or your window.
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