4 different ways to make it & info. on each way https://salvagedinspirations.com/best-homemade-chalk-paint-recipes/
I use 1/3 paint, 1/3 Calcium Carbonate, 1/3 plasters of paris.
Calcium Carbonate: https://amzn.to/2BWiTNc
Plasters of Paris: https://amzn.to/2RsITti
I use plaster of Paris, water, and latex or acrylic paint https://www.justalittlecreativity.com/2013/03/diy-chalk-paint-rocking-pony-makeover.html
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There are actually three ways to make chalk paint. The first is two cups paint to half cup baking soda. The second is two cups paint to half cup plaster of Paris. The third is two ounces unsanded grout to eight ounces paint.tr