Marking Chalk is a removable spray chalk designed for temporary marking on pavement, soil, and grass. This product is packaged in an aerosol can that is operated only in an UPSIDE DOWN position. 15 net wt. 20 oz can. Aervoe inverted marking chalk is ideal for marking on private property, construction sites, utility identification, sports fields, landscaping, and other general marking applications. This product can safely be used on grass turf, and will not harm grass roots. The chalk will gradually disappear with water, traffic, or other abrasions, but will generally remain visible for up to three weeks depending on weather and traffic conditions.