Smart Strip Porous Surface Graffiti Remover is a non-drip, deep penetrating gel formulation that dissolves graffiti from unpainted porous masonry substrates within 15 - 30 minutes. This innovative formula delivers high performance without surface damage. Perfect for porous surfaces that have been defaced by aerosol spray paints, crayons, markers, and other unwanted paints and coatings. Smart n Easy Porous Surface Graffiti is ideal for restoration of historic stone and porous surfaces, salvaging the substrate and avoiding traditional damages from scraping, grinding and various blasting techniques. BOV comes in a spray can powered by compressed air. This makes the product safer, easier to use, and cuts down on waste.