Windshield install with butyl - is butyl primer needed? Options

[Kansas 914]

I have brand new paint on the car. I remember the last time I had a windshield installed by I don't think the installer used primer.

Is it best to prime the frame first and is butyl primer the right stuff?

Like this? https://www.amazon.com/CRL-Pinchweld-Primer...uct_top?ie=UTF8

[lierofox]

https://www.amazon.com/gp/product/B00473W5V...=UTF8&psc=1

I used this stuff to primer my windshield and frame.

Buddy of mine was the son of an auto glass guy so he helped with installing dozens of them over the years. Primer every time or it'll eventually begin to leak. I think he mentioned that it also helps provide a bit of extra protection to the butyl since it helps to mask the sunlight, in addition to the glass blocking the UV.

From what I understand, modern urethane adhesives, when they grab on, hold on WAY too well and the windshield becomes a structural/shear member of the car, and all the flex ends up being transferred into the windshield glass, which the 914 windshields were never designed to be used for, causing them to crack.

[stevegm]

https://www.amazon.com/gp/product/B00473W5V...=UTF8&psc=1

I used this stuff to primer my windshield and frame.

Buddy of mine was the son of an auto glass guy so he helped with installing dozens of them over the years. Primer every time or it'll eventually begin to leak. I think he mentioned that it also helps provide a bit of extra protection to the butyl since it helps to mask the sunlight, in addition to the glass blocking the UV.

From what I understand, modern urethane adhesives, when they grab on, hold on WAY too well and the windshield becomes a structural/shear member of the car, and all the flex ends up being transferred into the windshield glass, which the 914 windshields were never designed to be used for, causing them to crack.

So you just put the primer on the windshield channel on the car where the butyl touches? As well as on the windshield?

[lierofox]

So you just put the primer on the windshield channel on the car where the butyl touches? As well as on the windshield?

Yep! We did it back in 2017 (and no the car hasn't gotten any prettier since then)

Here's the windshield itself, cleaned and scraped and wiped as spotless as possible with ammonia free cleaner, alcohol, and finally dried before the primer was applied.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-18880-1581534405.1.jpg)

And here's the windshield frame, similar cleaning treatment was given with alcohol.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-18880-1581534405.2.jpg)

Work slowly and CAREFULLY when pressing it into place, especially around the corners to avoid cracking, should look something like this when it's all set in place.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-18880-1581534406.3.jpg)

Use the spacer blocks and preferably a buddy to help you guide it into place.