The phrase "to paint the glass" means to cover or coat a glass surface with paint.
Sentences with «to paint the glass»
I had never painted glass in my whole life, but this project is worth trying. (momskillsblog.com)
The ocean views outside the windows served as inspiration for the back - painted glass backsplash in the same cool turquoise hue, which runs throughout the room. (styleathome.com)
Simply take your copper paint and paint the glass ornament. (nousdecor.com)