A special refrigerant propellant freezes metal to as low as -50°F/-45°C causing contraction of the metal and creating micro-cracks in the corrosion and galvanically fused metal parts to free themA penetrating release agent breaks down and flushes out the rust after the metal contracts and breaks looseFor best results spray the seized part for 10 - 20 seconds or more depending on severity then let sit for several minutes17 ozAerosolUPC/EAN/GTIN: 036121710337