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HOMEMADE CHALK PAINT (another post says to mix the grout with 1 tbl water, mix then add to paint) 1st then
Make your own chalk paint by using plain interior paint mixed with Plaster of Paris. You can find Plaster of Paris at Home Depot or Lowe's and it's really cheap. All you do is mix 5 tablespoons of Plaster of Paris with 2 cups of paint and 2 tablespoons of water. Just combine ingredients and stir well. It may even be a little lumpy, but that's okay. Once you brush it on, it evens out.
homemade chalk paint recipe - Best tip I learned form a professional furniture painter is PATIENCE. Several coats of paint and let it dry for at least 24 hrs between coats.