Sometimes stained glass windows are found in very difficult places to access. Periodic maintenance gets overlooked, paint and caulk eventually fail letting weather take its toll. Following is an unpleasant but easily rectified example of what can be encountered.
A closer look suggests the need for attention may have been apparent long ago, resources may not have been available. Sometimes well-meaning stopgap repairs cause further damage.
After removal of the window, sash and moldings a deteriorated frame was revealed.
Above deteriorated sections had to be removed and replaced with new material at the correct radius.
Centered in the image above are radius moldings milled, primed and painted. With the stained glass panel and sash restored the window was ready to be reinstalled.
Accessibility issues made this window a good candidate for protective glazing after repairs had been made.