I have two foggy windows. I dealt with this issue on the first bus and I keep putting it off on this one because unless I take the single thickness glass approach this problem never goes away. Prevost has never sold side window glass that did not fog almost immediately and dealing with Sikaflex is very low on my list of things to do. I would rather change airbags.
I am likely to fix them before OKC, but I think I will do the repair myself by disassembling them and resealing them. I just have not decided how I want to do that. I am likely to follow John's recipe. I will not get replacements from Prevost.