Howdi Tex, It's a little difficult for me to understand which windows you're talking about. Are you having problems reassembling the Vista views up on top of the camper? Or are you having trouble the wing windows on the front of the camper that Chuck shows a picture of?
Here's why I ask.
The VIsta Views on my camper can be easily taken apart and cleaned, then reassembled. As Pick stated, not all of them can be.
The WIng Windows in Chuck's picture can also be taken apart and reassembed (at least on Chuck's trailer and mine). Chuck and I have been discussing the proper way to do this, but have yet to hit a "truely good" method. I attempted to take the curbside window apart a couple of weekends ago, but I can't the screws to come out of the interior side of the frame. How did you do it?
As far as gaskets, etc. Both the VIsta Views and Wing windows on my trailer have an outer piece of glass that seems to be held in by Vulkem. Then some type of what I call "glazziers putty" is formed into a bead betweeen the outer pane and the inner pane. The inner pane goes in next (Plastic for the Vista views, glass for the wing windows). The the snap ring goes over the Vista view assembly, a rigid frame for the Wings.
If you've got pictures of where you are in the process, I'd love to see them. It'll really help us all out in the long run.
Here's the thread where Chuck and I were discussing this problem: