Is it normal to get grittiness when you use Calcium Carbonate chalk paint? Calcium Carbonate. CDN$22.70. It’s the magic ingredient to chalk type paints…and my favorite to make homemade paint. NOW Calcium Carbonate Powder, 12-Ounces 4.7 out of 5 stars 681. Calcium Carbonate Powder"Greenway Biotech Brand" Chalky Paint Additive Limestone Powder Rock Dust Very Fine Powder 3 Pounds 4.6 out of 5 stars 99. Calcium carbonate is chalk powder. We recommend using 4-8 cups of Calcium Carbonate per gallon paint depending on how smooth you want your chalk paint. Chalk-Tique Powder Additive – Transforms Regular Paint Into Chalk Paint – Perfect For Your DIY Paint … CDN$88.99. Yes, Calcium Carbonate, Water, and Paint is all you need to make chalk paint. What is Chalk powder? Above are the chalk …