Getting a window to go from this to this. Is a lot of work and through the spring/summer I managed to get four of the seven windows in the parsonage fully restored.
You have to completely remove the sash, strip the inside and outside of the sash, repair any damage and then you can glaze.
Reinstalling the glass, fully clean and then you can glaze. Now the glaze takes about two weeks to cure.
Then you can rehang them, of course with new rope for the weights.
Though lets not forget about the interior trim, that needs to be stripped and cleaned...then repaired...
In the end though, it is worth it. But you will notice, you still need to use a safety scrapper to scrape the over paint on the glass but leaving just a hair to protect the glaze.