Rust Prevention - around the windscreen.
08-29-2012, 07:44 PM
#16
Rennlist Member
A product that I have used is Permatex Flowable Silicone Windshield and Glass Sealer - 65AR.
I've used it as a potting compound. The product flows extremely well (would have to apply it with the car on a slope) and seeps into all crevices. I tried removing it; it clings to the plastic potting box I used, like crazy.
Other uses: sealing plastic light assemblies.
I've used it as a potting compound. The product flows extremely well (would have to apply it with the car on a slope) and seeps into all crevices. I tried removing it; it clings to the plastic potting box I used, like crazy.
Other uses: sealing plastic light assemblies.
08-29-2012, 08:33 PM
#18
Drifting
Now if you ever have to replace your windshield, won't this be a PIA with the silicone there?
And if water does somehow get thru the silicone, it will basically be trapped now.
And if water does somehow get thru the silicone, it will basically be trapped now.
08-29-2012, 08:40 PM
#19
Shock! Thought it was about time a spanner was thrown in. This is a preventative. I would rather have a hard find pulling out the screen than deal with corrosion. Done properly water shouldnt get in there.
08-30-2012, 04:42 AM
#20
But if there is no damage, ie; if the car has had that area repaired and painted then rust wont develop. Im sure the corrosion is caused by windscreen replacement most of the time. Any original owners who have their original screen had any issues here? Mine has just been repaired but had a replacement screen fitted badly about 7 years ago
08-30-2012, 05:32 AM
#21
Three Wheelin'
Thread Starter
...so here we are two years later.
Knight - if I have to replace the screen then the silicone will make things more difficult. So what? The sealant I have added means no water gets in, no air gets in, therefore rust cannot form.... or at least it is slowed down to a rate that will not cause a problem before the rest of the car disintegrates.
That's all I care about. Removing/refitting a screen is the screen-fitters issue. I'll be getting it done by someone who knows what they are doing so there won't be any damage.
911Pervy - so why do Porsche tell you to completely fill the aperture? Because corrosion is caused by water and air sitting on painted metal trapped in the corners. And the plastic/rubber trim when refitted into the windscreen surround rubs against the paintwork as the car flexes, which is another poor design, ameliorated by the teflon tape that was fitted at the factory (on my MY96 at least).
You really don't want anywhere for the water to be able to sit.
Knight - if I have to replace the screen then the silicone will make things more difficult. So what? The sealant I have added means no water gets in, no air gets in, therefore rust cannot form.... or at least it is slowed down to a rate that will not cause a problem before the rest of the car disintegrates.
That's all I care about. Removing/refitting a screen is the screen-fitters issue. I'll be getting it done by someone who knows what they are doing so there won't be any damage.
911Pervy - so why do Porsche tell you to completely fill the aperture? Because corrosion is caused by water and air sitting on painted metal trapped in the corners. And the plastic/rubber trim when refitted into the windscreen surround rubs against the paintwork as the car flexes, which is another poor design, ameliorated by the teflon tape that was fitted at the factory (on my MY96 at least).
You really don't want anywhere for the water to be able to sit.
08-30-2012, 07:36 AM
#23
Racer
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Hi
I had a 1997 with an original front windscreen replaced last week and there was no rust.
Although the person doing the glass did scratch the paint, but I fixed it.
The glass person had no intention of fixing the scratched paint. Typical
Interesting our cars are galvanized, that should help.
I think the biggest issue is scratched paint or bad painting with dirt build up in the window gaps with water added and then in other parts of the world where salt is put on the roads, creates a bigger problem.
Fill the gap with silicone................................
I had a 1997 with an original front windscreen replaced last week and there was no rust.
Although the person doing the glass did scratch the paint, but I fixed it.
The glass person had no intention of fixing the scratched paint. Typical
Interesting our cars are galvanized, that should help.
I think the biggest issue is scratched paint or bad painting with dirt build up in the window gaps with water added and then in other parts of the world where salt is put on the roads, creates a bigger problem.
Fill the gap with silicone................................
08-30-2012, 11:18 AM
#24
Racer
But, how high up would you flow the silicone caulking? Can't really take it all the way up the A pillars?
Also, what about the same problem with the rear window? Same design flaw. I don't drive in the rain and always peel back the cover to dry it out. Luckily as a multi owner car, I don't have any problems as of yet.
Also, what about the same problem with the rear window? Same design flaw. I don't drive in the rain and always peel back the cover to dry it out. Luckily as a multi owner car, I don't have any problems as of yet.
08-30-2012, 06:12 PM
#26
08-31-2012, 04:46 AM
#27
Ok, so painted undamaged metal will still rust? No air can get to the metal, the zinc coating from factory is still intact, interesting
To OC, to say its not your problem to remove the stuff if a new screen is needed is a little flippant, you must agree that to remove all the sealing there is more chance of paintwork getting damaged and therefor more chance of it needing repainting?
I just dont know what to do with mine! Sods law if I did it I would need a new srceen, and if I didnt do it the screen would last for another 10 years!
To OC, to say its not your problem to remove the stuff if a new screen is needed is a little flippant, you must agree that to remove all the sealing there is more chance of paintwork getting damaged and therefor more chance of it needing repainting?
I just dont know what to do with mine! Sods law if I did it I would need a new srceen, and if I didnt do it the screen would last for another 10 years!
08-31-2012, 06:09 AM
#28
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This screen surround rust issue is an ongoing PIA for me. I had the screen removed and the whole area treated and repainted May last year. The rust was getting quite bad but I was amazed to hear the body shop inform me that it looked like the screen had been out before for the same problem.
The work seemed fine initially, although I later found scratches on the wings where the screen fitter had been leaning over. The screen was undamaged during the whole process.
The car was then garaged for 6 months in October for other work and taken out late April and while washing it, I noticed some little paint bubbles in front of the screen rubber, the rust had returned!
I'm now faced with forking out again to get it redone, needless to say it won't be the same shop.
The work seemed fine initially, although I later found scratches on the wings where the screen fitter had been leaning over. The screen was undamaged during the whole process.
The car was then garaged for 6 months in October for other work and taken out late April and while washing it, I noticed some little paint bubbles in front of the screen rubber, the rust had returned!
I'm now faced with forking out again to get it redone, needless to say it won't be the same shop.
09-04-2012, 08:05 PM
#29
Three Wheelin'
Thread Starter
Ok, so painted undamaged metal will still rust? No air can get to the metal, the zinc coating from factory is still intact, interesting
To OC, to say its not your problem to remove the stuff if a new screen is needed is a little flippant, you must agree that to remove all the sealing there is more chance of paintwork getting damaged and therefor more chance of it needing repainting?
I just dont know what to do with mine! Sods law if I did it I would need a new srceen, and if I didnt do it the screen would last for another 10 years!
To OC, to say its not your problem to remove the stuff if a new screen is needed is a little flippant, you must agree that to remove all the sealing there is more chance of paintwork getting damaged and therefor more chance of it needing repainting?
I just dont know what to do with mine! Sods law if I did it I would need a new srceen, and if I didnt do it the screen would last for another 10 years!
a) locate the screen properly
b) not scratch any metal.
Everybody wins.
Remember - it's Porsche telling you to fill this cavity with a sealant.
09-04-2012, 08:07 PM
#30
Three Wheelin'
Thread Starter
This screen surround rust issue is an ongoing PIA for me. I had the screen removed and the whole area treated and repainted May last year. The rust was getting quite bad but I was amazed to hear the body shop inform me that it looked like the screen had been out before for the same problem.
The work seemed fine initially, although I later found scratches on the wings where the screen fitter had been leaning over. The screen was undamaged during the whole process.
The car was then garaged for 6 months in October for other work and taken out late April and while washing it, I noticed some little paint bubbles in front of the screen rubber, the rust had returned!
I'm now faced with forking out again to get it redone, needless to say it won't be the same shop.
The work seemed fine initially, although I later found scratches on the wings where the screen fitter had been leaning over. The screen was undamaged during the whole process.
The car was then garaged for 6 months in October for other work and taken out late April and while washing it, I noticed some little paint bubbles in front of the screen rubber, the rust had returned!
I'm now faced with forking out again to get it redone, needless to say it won't be the same shop.