Once the rubber and trim are on the windows, feed a piece of wire or cord into the body groove of the window and give it a healthy dose of silicone. Some suggest soapy water as they feel petroleum products prematurely break down the rubber, but we like using silicone because it isn't as messy as soap and water. Have a friend push on the outside of the glass while you pull the string, in effect, pulling the lip of the rubber over the window lip and into the car.