Quik-Mark™ Water-Based Inverted Marking Chalk is great for temporary markings on common outdoor surfaces. It is easily removed from hard surfaces with a wire brush and water. Our marking chalk formulation lasts 30 days or more, depending on conditions. Our marking chalk performance eliminates costly remarking, clogged and wasted cans, and allows marking with confidence in a variety of weather conditions. Selecting this high quality marking chalk will increase customer satisfaction while lowering overall costs.