It was a nice day today, so Frank took the afternoon off to spend some time with the airstream - now fondly dubbed the 'Airbus 500".
He took a scraper to the window edges and removed the silicone that had been applied later on in the Airbus's life. Then he cleaned off the gunk with some solvent of some kind, and went at the cracks around the window seals with Vulkem 45 that he had put into a medicine syringe - nice fine lines and specific placement.
Then he took the drip edge off over the door and did the same there - some of the rivets had just deteriorated from all of the excess water - so he cleaned that up, and used the syringe there too. He is currently removing interior panels form the bedroom area to track down more window leakage.
Frank also consulted with our local glass guy - who agreed that having him fix the thermpanes would be costly, but is willing to lend Frank his shop and experience this winter, and show him how it's done.
I think he is just gratefull that this never ending rain has stopped for a bit, so he can get busy in there.
He's been using the search button as you have all suggested, and has spent lots of time reading other people's threads.
Very helpful stuff guys! Thanks!