Here's all the facts.
The Windshield (window) system consists of plastic brackets (half round) that you cut to size and glue flat side up on the inside of your vehicle around the window opening, top, sides and bottom if needed. The window glass is a clear mylar sheet that you cut larger than the window opening. After the brackets have dried completely, you press the mylar against the opening from the inside and mark the location of the brackets on the mylar, cut the mylar slightly larger, then it's just a little fine tuning (trimming) to get it to fit tightly against the window frame. The mylar snaps into place and is held in place by the brackets.
TA DAA..... no glue on the glass, ever, really cool, I got hold of some of my own mylar, tinted, and now I own a PIMP MOBILE, lol