.75oz Heavy Duty Radiator Stop Leak (Carded)

Stops Leaks Safely, Quickly & Easily, Compatible With Antifreeze. Heavy Duty Radiator Stop Leak will work faster and stop larger leaks than the so-called liquid stop leaks or the non-metallic powdered stop leaks. Most "liquid stop leaks" and "non-metallic powder stop leaks" contain powder, wood, paper and other fibrous materials. They simply plug a hole and never harden. Heavy Duty Radiator Stop Leak contains expensive pure copper particles plus special hardening and sealing agents. Quick triple action seeks out leaksfills and seals them with pure copper.