Warco Heavy Duty Stop Leak is a fast-acting, permanent seal for cooling system leaks including aluminum. Safely seals radiator leaks, cracked engine blocks, heater cores, cylinders and gaskets. Contains effective water pump lubricants and corrosion inhibitors.
Quick and easy (!)
Helps stop radiator leaks and loss of antifreeze
Helps repair water cooling systems, radiators, wawter pumps, and heater cores
Does not harm hoses, gaskets, water pumps, metal parts