I heard about someone putting rubber between the glass and the outside trim molding to stop a rattle or leak or something. the only rubber that touches the glass is the butyl seal that holds the inside of the glass to the outside of the window frame.
Did you take the glass out?

__________________
Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si