Brought my 1985 car in 2 years ago to get work done on the windshield. They used butyl tape to my knowledge instead of using polyurethane adhesive. Didn't know this till I took it to midwest auto glass and was told this and showed me the difference. He also showed me how my windshield has slid down from the original spot and and is why it was leaking again. Jayhawk told me that they could fix it with the correct adhesive, but it would cost me 100 for them to use the correct material cause it's been longer than a year. And that's all their warranty covers. Very disappointed at them.