Product Description Montana Remover is a non-pollutant, pH-neutral etching spray that dissolves and removes lacquers quickly and thoroughly. It works great on walls, clay bricks, stone, concrete surfaces, marble, bitumen, glass, metal and wooden surfaces. Do not use on cars! This spray has a gel-like consistency that prevents it from running off of vertical surfaces. Application on non-ferrous metals might cause discoloration. Use on clean, dry surfaces and let sit for at least 10-15 minutes before scraping off. Repeat if needed. Warning for CA Residents Prop 65: Prop 65=WARNING: Cancer – www.p65warnings.ca.gov