windshield install question

Many older seals for windshields and back glass for that matter do not use a sealant when being installed. If it is a rubber seal that fits around the glass and is the type that can be installed with a rope there is no need for sealant. I've done a lot of them that way and never had a leak yet. There could be a case made for the condition of the "fence" or frame around the windshield opening. If there are dents or corrosion damage then you may want to consider using some sealer but like has been said it will make a friggin mess. My 2 cents