If you take an old picture frame and paint the glass with chalkboard paint you can make one that hangs. You can paint the old frame to make it look really cool!
My friend taped part of her wall in a square box. Then she used the black board chalk to cover it. She also had a smooth surface and she wasn’t happy with the coverage. She had to keep spraying it time after time. She later made another one and she was happy with it but I am not sure what she did to fix it. Maybe it was ruffing it up a bit! 🙂
I think my pinterest has a pic of the painted frame. Go to pinterest and type in sherry heiman or sherry 3300.
Good Luck and I hope it turns out.