Windshield sealer

"You actually should use both. A butyl strip inside the gasket and pinch weld and a urethane between gasket and glass."

Mullinax........

Do you mean to use a strip of butyl tape on the pinch weld all around the windshield before installing the gasket and windshield, or do you cram it into the channel on the gasket?

If not tape, is it butyl from a caulking gun? If so, do you just apply it into the channel on the gasket before installing?