Our Bar's Leaks pelletized radiator heavy-duty stop leak is specially formulated to seal larger leaks better than other stop leak products. You'll find plenty of powder formula radiator stop leak products on the market, but you won't find a seal coolant leak solution that beats ours in effectiveness. Our pelletized radiator heavy-duty stop leak is versatile, too, working safely and effectively on plastic, aluminum and metal radiators, heater cores, gaskets and freeze plugs. It also has a water pump lube that lubricates water pump seals and inhibits the formation of rust and scale. Simply put, it's the fast, effective, easy-to-use powder formula radiator stop leak that's just as simple and straightforward for a regular driver as for an experienced mechanic. Convenient solutions to seal coolant leaks shouldn't be limited to just those with advanced automotive knowledge, which is why each product in our catalog is designed to meet the needs of anyone who gets behind the wheel of a vehicle. In under an hour, you can quickly and easily solve that once-dreaded leaky radiator. Give it a try and get your car back on the road in no time.