To "Glue" or-not-to "Glue!

[nene]

I am in the process of replacing my front windshield seal and wanted to get opinions on whether to "glue" it or not? I have read several posts notating to "Glue" in the windshield to avoid rust issues down the road.

Thanx,

Serge

[kodioneill]

No glue, new gasket.

[porterdog]

Depends on the model year; the 964 (and later?) units were glued at the factory.

[wayner]

Yes glue, my new gaskets leak

...There, its a tie

I received the following recommendation and I just used this on another model car as a test.
Going to redo my new seals on my 1973 911, and yes, I did use the recommended seals but still got tiny visible leaks under the right conditions.

I got this recommendation from somone here. This is what I will use when I redo them one more time.

3m Auto Bedding and glazing compound.
(I guess technically it is not a glue, and can be more easily removed and cleaned up later)

P.s. I am also the one who started the thread on why seals should be a regular maintenance item.
I don't know anyone who has removed and installed glass as many times on the same single car or exposed it to as many elements as I have for research purposes (versus for paying customer purposes). Each time I have removed it and replaced it with yet another new seal I find evidence of moisture even in areas where I had not detected the initial leak.

[nene]

I really think gluing it would be double-assurance of it not leaking.

This is for an 86 Carrera.

[TheSt|G]

Originally Posted by wayner

Yes glue, my new gaskets leak

...There, its a tie

I received the following recommendation and I just used this on another model car as a test.
Going to redo my new seals on my 1973 911, and yes, I did use the recommended seals but still got tiny leaks.

Here is what I will use when I redo them.

3m Auto Bedding and glazing compound.
(I guess technically it is not a glue, and can be removed and cleaned up later)

P.s. I am also the one who started the thread on why seals should be a regular maintenance item.
I don't knwo anyone who has removed and installed glass as many times on the same single car or exposed it to as many elements as I have for research purposes. Each time I have removed it and replaced it with yet another new seal I find evidence of moisture in areas where I had not detected the initial leak.

Got the thread link?

I'm of the same mindset(already replaced a ton just because it is a 30 year old car) and I would love to see your thoughts on it.

[nene]

Wayner, I did have an opportunity to have read your lengthy thread, and that is why I bring the question up. Thanx for the research.

Serge

[wayner]

My other thread mainly documents the carnage.

This current thread that we are on is a good place to ask and debate the issue. Thanks for starting it Serge

I think this applies to all 911/912 cars up to but not including 964s

[wayner]

Here is the other thread
Why windshield trim should be a regular maintenance item.

[ClickClickBoom]

Huh,
Installed mine without glue, works in downpour that overpowered the windshield wipers on high. The seal was the Pelican aftermarket one as well, proper install was/is the key. Glue will not solve for improper installation.

[JAR0023]

Originally Posted by nene

I really think gluing it would be double-assurance of it not leaking.

This is for an 86 Carrera.

Don't do it. If installed correctly with the OEM gasket(avoid the a/m gaskets), the windshield will not leak. I replaced mine last year. The old gasket had been "glued" more than once. I spent 3-4 evenings in the garage cleaning all that crap up. New glass, new OEM gasket, old trim. Half hour to install and zero leaks in 12 months and 10k miles. -J

[cabmandone]

I installed my new seal without glue. I used a method recommended by another Pelican of tapping the aluminum trim ring at the corners to move the seal over into place. I haven't driven it in the rain nor do I plan to so I can't tell you if it leaks or not. I personally don't see a need for sealant if the new seal is installed properly.

[wayner]

I'm curious then why the factory installed seals eventually leak?

[nene]

JAR, of course I am concerned with the leaking effect, but trying to be proactive and avoiding the water creeping in between the seal and the car and begin the "rotting" effect.

[ClickClickBoom]

Originally Posted by wayner

I'm curious then why the factory installed seals eventually leak?

AGE, the seal is not a lifetime part. Rubber ages, and then shrinks, causing leaks.

[wayner]

Just for reference, I am not a big fan of urethane to glue these but I really do like how the 3m glazing compound that I mentioned above works with these seals

[cabmandone]

Originally Posted by wayner

I'm curious then why the factory installed seals eventually leak?

I'm going with "shrinkage" and the fact that some owners don't pay attention to how the seal mates to the window frame and allow gaps to open up without addressing them.

[kodioneill]

Originally Posted by JAR0023

Don't do it. If installed correctly with the OEM gasket(avoid the a/m gaskets), the windshield will not leak. I replaced mine last year. The old gasket had been "glued" more than once. I spent 3-4 evenings in the garage cleaning all that crap up. New glass, new OEM gasket, old trim. Half hour to install and zero leaks in 12 months and 10k miles. -J

I've installed 20 or more no glue no leak. If you glue it have fun trying to remove it.

[Ken911]

Well if you have ever had the unpleasant experience or the windshield blowing out at at around 150mph then you'll glue it. My 85 had the window try to blow out during a high speed run. seems the cabin was pressurized by the air coming in the front vent. I could see daylight around the bottom passenger corner. Pulled it out got a new gasket and glued it in.

[Trackrash]

According to my manual (Haynes) "From Dec. '69 USA models have a glued-in windshield.... Your Porsche dealer will be able to supply the glue...."

I didn't glue mine in when I replaced my seal in '85 and haven't had any problems, but I avoid rain.