Any Professionals have tips for installing windshields?

Everything I have read, including tech from Mopar Action Rick Ehrenberg, says that some type of sealant is needed.
I installed a windshield in a 74 Duster using no sealant. I was not pleased when I washed it and it leaked. I pulled it and tried a second time, this time using the sealant. ZERO leaks.
The rear of the Duster/Demon/Dart Sport is the same. While these do use a locking strip to tighten the fit, the factory used a thin bead of sealant on the steel channel before setting the gasket. I've parted out numerous A bodies and seen plenty others in junkyards. Each one has shown signs of a sealant.
In most cases, the window gaskets are still in great shape and are reuseable. It may be different in hot weather states like Arizona, NM and Texas where the rubber and plastic parts on cars disintegrate quicker.