So, I figured I would go up there to see what they actually put on it since I had some time today. Another crap job. So they put black silicone and covered it with either white silicone caulk or perhaps they uses a thin coating of Alpha 1021.
Here is what I pulled off in one easy strip, and then just had to clean up some residual white sealant.
As you can see it tore very easily and was a very thin layer. With the flexing and vibration of driving an RV that probably wouldn't have lasted a month.
So - I ripped it off and cleaned it up as best as possible. First scraping, then dawn dish soap, cleared that off, and then denatured alcohol. Applied Eternabond and then (even though this probably isn't necessary) sealed and covered the Eternabond with a tube of Dicor.