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All you need to make your own blackboard paint without buying a whole can and having all that left over is two ingredients: acrylic paint and unsanded tile grout powder, which you can buy in a small sack.
For a small project, mix 1/4 cup (or a 2 oz. bottle) acrylic paint of your color choice and 1 1/2 tsp. grout powder. Mix up your paint and apply three coats with a foam brush, letting it dry thoroughly between coats. Brush crosswise to the prior coat each time.
When the third coat is dry, rub a piece of chalk over the entire surface to condition it then wipe it off with a soft rag like an old sock. You now have an inexpensive chalk board. This works on the cover of hard cover notebooks, so your kids could personalize their notebooks for school.
By Ann W. from Loup City, NE
Great idea. Putting this on my try list.
Small can of blackboard paint is not that much and unless you are making a very small project you will not have much left. I also found it to be just easy to spray it on what ever I need it to be on. You could also split it with someone! You could also make small chalk boards for kids for Christmas and put some chalk with it!