CHALKSPRAY is a pigmented chalk paint ideal for temporary outdoor markings on non-porous surfaces as well as indoor artwork. Available in 10 powerful shades that are deeply matte and opaque. Montana CHALKSPRAY can be applied to a variety of surfaces. Depending on weather conditions and climate, outdoor markings will last from several weeks to several months. It will fade more quickly in prolonged rain or high traffic areas. On non-porous surfaces such as glass or metal, the pigments are easily removed. Removal from porous surfaces may be more difficult. It is recommended to perform a test application and removal on a non-porous surface before working on a non-visible area of the substrate. Montana CHALKSPRAY stands out for its feel and look - the typical effect of rough chalk. Chalk has a very unique aesthetic - and Montana CHALKSPRAY brings that aesthetic to a spray that works on almost any surface!Depending on weather conditions and climate, outdoor marking will last anywhere from several weeks to several months. Montana CHALKSPRAY also works well on canvas, cardboard or other primed surfaces due to its excellent opacity. CHALKSPRAY becomes permanent when sealed with varnish (for example, when used on a canvas). It also allows further applications with brush, spatula or other tools. For clean and precise lines, we recommend using Montana LeveL Caps 3 to 6 (3 and 4 for fine and medium lines, 5 and 6 for wide lines and filling large areas).