Dow Corning GP_AC Silicone, 280 ml Cartridge, Clear The Dow Corning GP Silicone, 280 ml Cartridge, is a suitable sealant for gap filling, it requires a caulkin gun for dispense. This is perfect for glass and aluminium joints. It is also U.V resistant for both interior and exterior applications. However its not fit for Masonary and concrete joints.