Rust on the roof above the windshield

[Potent68]

I just found rust above the windshield on my 2008 Sierra 3500HD.  I've owned the truck since it was new and live in Oregon where we don't salt the roads.  I'm very surprised by this.  You can see in the pictures it's worse than just what the exposed spots are showing you.  Has anyone ever seen that before on these GMT900's?

[davester]

Has the windshield been replaced?  If so, perhaps whoever did it botched the job and scratched up the paint?

 

It also could just be thin paint, it's not terribly uncommon for paint to peel on these trucks.

[Potent68]

I have never had the windshield replaced but your idea there would otherwise definitely make sense. What surprises me is that it got under all of the layers, not like the usual flaking clear coat you occasionally see. 

[CamGTP]

My previous truck was a 2012 and there was a few rock chips on that edge between the glass/roof. Lets just say it started to rust there very fast and by the time I wanted to do anything about the rear fenders started rusting so I just traded the truck in. I see many other trucks with bad rust there in the 2007-2010 range too.

[Colossus]

some blends of windshield washer fluid can also cause issues. 

[Colossus]

My 08 at 200,000 miles is starting to rust in spots as well.  Not too happy but rust happens, no matter how well we take care of things