I purchased a set of OER chrome moldings for my quarter windows. I am looking for some expertise on installing them (glass is in the car). I have looked at all the posts on the subject, and still have questions - I know the originals were pressed on with a tar like paper. The Aftermarket come with rubber channels, but by themselves do not hold the molding on firm enough. If I use urethane to glue the molding, do I glue the rubber channels to the glass first and then glue the chrome molding over the rubber channel with another bead of urethane? If I use urethane, can I just eliminate the bubber channels and glue the glass directly to the chrome piece?