[Hank70SS]

A good glass shop won't use butyl to set a windshield. It's not approved and if the windshield pops out in an accident and someone follows it out of the car you can sue them if they did use butyl. From what I found Chevy did not use butyl on these cars although many people think they did. They used some type of adhesive and a cloth covered damn, maybe even butyl inside, to keep the adhesive from squeezing out where it's visible. Don't recall the name of products they used, that was over a year ago. A lot of the info was from guys that worked in the assembly plants back in the day.

A lot of people do use butyl rope and if the window pops out that's probably the least of your problems. Just stating what I found in my research.