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I had a backglass come out back in the late 80's or early 90's when we were using butyl for the dam and backfilling with a very low modulus urethane. The defroster wires held it, but cleaning the butyl from a white vinyl top on a 90 degree day in the customers driveway is something I'll never forget.V4
Have never ever had a piece of glass installed with butyl blow out,
we must be a gullible audience. One of our bosses did install a back
glass with urethane in the early days that blew out of the car. It must
have been in the early days of push in rubber moldings. Safe drive away time
hadn't been invented yet. Glass didn't even break, surprise considering the
customer was driving at highway speeds and rolled down the window. It was a light yellow car, the molding had blown all over the paint leaving urethane every where, we scrubbed the vinyl top for a long time.
I've seen several back glasses blow out after someone installed them with butyl. A couple were saved by defroster wires and a couple landed on the highway and shattered. The customers brought them to us because they knew we would do them correctly.