The Aervoe Spray Marking Chalk in White features a special blend of materials, making it safe for use on a wide variety of surfaces. The product is designed for temporary upside-down marking. Marks will usually disappear after between ten and twenty days when exposed to traffic, water, and other abrasive action. You can also wash it off with a pressure washer. Spray marking can be helping in several hunting, survival, sport, and firearm situations. In tactical situations, spray marking chalk can allow you to set the boundaries of engagement. This spray product produces sharp and bright lines. It is safe for all surfaces and fitted with a standard tip that makes it compatible with a wide variety of machines. Aervoe Spray Marking Chalk is easily removed and doesn't require the use of any strong removal chemicals. It doesn't leave any ghosting and is a low-odor, water-based formulation for added safety when spraying in close proximity.