CHESTERTON 421, 448 ml aerosol Chesterton 421 Colorless Protective Coating is an impermeable, flexible plastic coating that protects surfaces from air, water, oils, chemicals and corrosion. The product forms a transparent barrier against water, moisture, salt air, mild chemicals, industrial fumes, fuels etc. up to 80°C. UN 1950 Cl.2.1, 23 points/aerosol Aerosol, flammable