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Precision weather strip products has videos, and more then once they say this is a dry install, use of a urethane caulk is highly recomended. I'm not sure on resellers like LMC, but most glass companies will refuse to do an install if they can't put the urethane in. Use of urethane to retain...

I was assuming he thought it was just black rtv, urethane doesn't dry hard, and remains slightly pliable. It's also a bear to remove, best success I've had was those strip discs you can put in a drill. But even then they clog up fast. Sent from my SM-S920L using Tapatalk

Starting in 1983(I think) it was required for all glass installers to start using urethane to retain the seal and help prevent glass ejection in case of a crash. Any car taken to a glass installer will have urethane used to retain the seal. An at home install isn't required to use urethane, but...