65 Valiant rear window install

What kind of sealer did you use? When I had my windshield put back in by the glass company they said that they could not put any type of vulcanizing sealer in it.

I did some research and chrysler never used any sealant before 66, the lock strips were so wide that the rubber from the gasket actually dug into the metal channel to form the seal.

If there is something I would like to know what it is so I can pull my windshields out and reseal them.