I would do as the manual says.I had my front one put in by a pro and he put urethane around the glass and gasket in the zip lock part and it leaked horribly.He did not put anything on the lower pinchweld and that is why it leaked.I showed him the manual and he's coming back to do it again,this time with the 3m bedding compound that the factory calls for on the pinchweld.Yes it is still avalible.
Joe