garyemunson, here's a tip about Amazon URLs - everything from the REF on can be deleted/removed and the link will work just fine.
https://www.amazon.com/Kohree-Sealant-30-Foot-Sealing-Patching/dp/B07V366FCM/Back on topic:
A couple of years ago the RVFogDr, repaired our windows. We pulled up to their shop at the end of the day and connected to their 50A service for the night. The next morning, they pulled us in their shop right after 8am. They pulled our 4 largest windows which had fogged up and took them to their workroom. After lunch they had the windows ready to reinstall and finished up about 4pm. We spent the night on their electric again that night and left the next morning. The cost was $300 for the first window and $200 each for the others for a total of $900 - cash or check (no plastic). I've never seen any hint of the fog returning. My MH is always outside and I'm very happy with their work.
