
Simply cut to desired shape with a sharp utility knife. Installation seems a bit awkward because you have to spray water on one side of the film and glass. However, it works fine. It's easy to install and I used a wide spatula to get rid of the air from under the foil. First squeeze out as much air as possible to the sides with a towel, then carefully remove even the smallest bubbles with a wide spatula. It definitely helps keep our garage cool!

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