Windshield gasket help

Man this is now confusing the crap out of me. All the controversial butyl vs. Urethane on the Web is enough to make ya crazy.

Windshield is out all the " pinch weld", if you want to call it that, is nice and clean. All I really need is SOME sealer to seal the gasket to the sheet metal. Then I'll fit the glass in.

Why would good Ole 3M weatherstrip adhesive not be correct for this job?

I need to get this done tomorrow. Will the Napa 4203 do this job properly? People say it will get hot in the summer and just "ooze away" causing leaks.