Montana Chalk Sprays are specially formulated for creating colorful temporary markings and creating the look and feel of rough chalk. Available in 10 vibrant shades; use these sprays outdoors or inside the studio. Each color is a deep matte with great coverage. Apply to sidewalks, brick walls, cardboard or canvas. Outdoor markings can last several days to several weeks, depending on weather conditions. Ideal for sidewalk art or signs at events and outdoor exhibitions. Pigments can be removed easily from nonporous surfaces like glass or metal. Montana Chalk Spray becomes permanent when sealed with varnish in the studio. Use with Montana Level caps 3 and 4 for fine and medium lines and caps 5 and 6 for covering large areas and creating thick lines.