I did spray the chalkboard paint right on the glass using several light coats. I realize these DIY blackboards are getting to be old news by now but I'm happy to have finally made one!
Not sure where these will go yet. I originally thought my craft room but perhaps our hall off the garage would be better. We got a new stainless (aka non-magnetic) refrigerator this winter and I miss having a surface to put up important notices. As we exit the house thru the garage that might be a good place to put up reminders...or chore lists for my guys (ha ha).
Oh, and check out this cute vintage canning jar I'm using for chalk. It has a glass lid and was another garage sale find.