Striping paints, marking paints, and chalks are used to add markings to outdoor surfaces such as concrete, pavement, grass, or gravel. Striping and marking paints range from temporary (lasting three to four weeks) to permanent. They are commonly used by utility workers, municipalities, and paint contractors to create bold, crisp lines and markings on parking lots, factory and warehouse floors, sporting facilities, athletic fields, and construction and excavation sites. Striping chalks temporarily mark surfaces for utility installations and are cleaned by using a wire brush or power washer. Heat-activated pavement markings mold tightly to pavement surfaces to designate lanes, parking spaces and directional instructions.