Industrial choice MC1800 system precision line inverted marking chalk creates bright, vivid temporary markings. This water-based paint creates marks that last up to 30 days on concrete, asphalt, gravel, grass, brick and dirt. Marks more linear feet than other brands. Provides clean, crisp marks. Easily removed with a wire brush or power washing. No-mess spray tip, guaranteed not to clog. Scuff resistant in 10 minutes.