Caulk Around Rear Windows
I had a spot on the bottom of my 2006 rear window that had rusted through to the inside metal. Inspection showed that the lower seal metal frame was slightly curved in. It looks like it was bad right from the factory. The lower sealant never bonded which allowed the water to get sucked in and rust heavily (probably since new so over 10 years).
Adding to that, there were a few spots around both windows where I could grind *most* of the rust, but not all of it. I was able to properly grind and repaint the outer... inner? curved metal edges though. That gave me a solid substrate.
I'm not skilled or ambitious enough to remove the rear glass, straighten the lower clinch web panel, and re-bed the window. I can paint and caulk.
I repaired the rust bubble areas all around the windows.
I then caulked all the way around both windows using Dicor Non-sag sealant. It comes in white, black, and some other colors. The sealant bonded well to the window edge and the metal channel.
I'm happy with the results. It ain't perfect, but looks pretty good even close up.
Here's some poor quality pictures.
The right window.
The left window left lower corner.
The right window right corner.
A section on the right window which I used heavy caulk. While caulking I noticed some rust that wasn't properly repaired. I put extra caulk on that area for over the winter. Next summer I will likely remove it and repair the bad spot. (The heavy caulk section is included in the first picture - upper left.)
Even that area doesn't really stick out.
This repair is similar to what I did for the front windshield rust problems. That repair has been good for over 3 years now.
I used white color sealant. I suspect that the black color Dicor will blend well with the window regardless of body paint color.
https://www.amazon.com/Dicor-551LSW1-White-Non-Sag-Sealant/dp/B003YJLIW8
Also available at most local RV stores.
vic
Added:
I used a similar treatment on my 2004 windshield. It is weathering well. No leaks to date.
https://sprinter-source.com/forum/showthread.php?t=36676