Liquid aluminum stop leak Formulated to permanently seal coolant leaks that are the cause of most overheating problems Not only seals but conditions the system Contains Xtreme Cool which stops overheating and reduces water temperature Guaranteed to safely and easily seal leaks in plastic, aluminum, copper and steel radiators; heater cores, gaskets and freeze plugs Use with all types of antifreeze including conventional green or blue and extended life orange, red or yellow For most vehicles leaks stop instantly 16.9 oz