I have insulated my windows for many years and have dealt with the most difficult windows to insulate. I've always chosen 3M because of the excellent tape (it doesn't peel off windowsills like other brands) and because the plastic film shrinks (until it's so clear you don't notice). But this current batch missed the mark. The film does not shrink much. There are noticeable creases that I cannot remove from the foil even 20 minutes after blow drying the foil. Even the tape feels less sticky and came off the (clean) window sills a few times when applying. The product is no longer of good quality.
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