Old window with glass
Decoart chalkboard paint- Great price here.
Instructions: Paint a thin and thorough coat of paint on the window glass. Paint in one direction. Allow the paint to dry for 1 hour. Now paint a second coat going the other direction. Allow paint to dry for 24 hours before use. I was careful not to get paint on the frame, but if it scares you to freehand paint, just tape off the edges.
I let these dry for a day, and then let my kids go to town with the chalk. They LOVE them!
This was my first time using Decoart chalkboard paint, and I was very impressed! The quality was top notch. I highly recommend using it for your next chalkboard project...I know I will!