Windshield Mylar install Question

The mylar strip is called a "lockstrip" and should be installed after the windshield goes in, to "lock" it in place. Install it on a nice,warm day....leave the car in the sun for a while to soften up the rubber gasket, then get some liquid dish soap and coat the lockstrip and the channel in the rubber gasket and install using one of those plastic windshield install sticks.