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Old 09-13-2016, 03:20 PM
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Join Date: Mar 2009
Location: San Diego
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Quote:
Originally Posted by Demothen View Post
Have you ever seen what happens when silicone is used to seal a windshield? Because I certainly have, that as well as silicone sealant at the bottom of door frames on an old VW I owned had caused enough rust to seriously impact the ability to restore the car, and lead to me selling it to someone who wanted to build a dune buggy. There are alternative sealants that arent corrosive.

Whether you like my advice or not, I am well within my rights to offer it. You may not agree, thats great, but someone else might find the information useful.

As far as "all the facts" - I'm sorry, I'm not a chemist, but here's a little research.
Silicone sealants and rust
RTV sealant can cause rust?
https://en.wikipedia.org/wiki/RTV_silicone "Certain types of RTV release acetic acid during the curing process, and this can attack solder joints, causing the solder to detach from the copper wire."

And I would remove a windshield to fix rust under it. I'm dreading that job on my W123 and hoping I don't have any major rust.
I am offering my 'been there done it' experience, diagnostic, fix and retest procedures to the OP. You offer nothing of value to the OP except to remove the windshield, fix all rust underneath, reinstall with new everything with professional help at $$$. The car may or may not be museum quality, mine is not, so silicon is the way to go. If it fixes it then all is well, if not then I will think of something else.

btw: I do not think silicon sealant will ruin any metal or paint or cannot be reversed. Good luck guys.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

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