Calcium Carbonate (Powdered Crushed Limestone) Paint Additive Description: Change up your living or work space when you use Calcium Carbonate Chalk Paint Additive. Although Calcium Carbonate has many purposes, this Calcium Carbonate Chalk Paint Additive is popular for making DIY chalk paint. All you have to do is add this to latex paint to make a chalky paint for use on furniture to give it an antiqued look, or on a blackboard to give you more control over the art than a conventional chalk stick. The granulates of Calcium Carbonate dry to a natural matte finish, which can then be left as is, or painted over with a glossy finishing coat?this product is very forgiving and versatile. Product Features: · Calcium Carbonate Powder - Limestone Powder · Paint Additive - Great to Make Your Own Chalky Paint (DIY) · Mixes Well with Latex Paint to Get a Unique Look How to make chalk paint: · 1-2 Cups) of Calcium Carbonate · 4 Tablespoons of warm/hot water · 1 quart of latex flat or satin paint