Sure Klean® Heavy Duty Paint Stripper - an alkaline formula with organic solvents - removes multiple layers of paint and graffiti from masonry surfaces. This slow-working, extended-contact remover, remains active for 24 hours. One application of Heavy Duty Paint Stripper dissolves heavy accumulations of paint, most spray paint, lacquers and graffiti, restoring old masonry to its original appearance. Follow paint removal with masonry neutralizing using the appropriate Sure Klean® product. Heavy Duty Paint Stripper contains no methanol, methylene chloride, or chlorinated solvents, and is water rinsable and nonflammable.