Super Radiator Stop Leak works quickly when poured directly into your radiator. One bottle stops leaks in all major parts of your cooling system, including your radiator, heater core gaskets, and hose connections. Protects against corrosion and pitting in your cooling system, the common reason for leaks.Ã?Ã Ã?Ã Ã?Ã This is a specially designed premium cooling system sealer with the added benefit of providing corrosion protection to cooling system metals. The formula's combination of natural and synthetic components provides the ability to seal leaks up to 0.016 X 0.5. What make this possible are the size, strength, and durability afforded by fibrillated Kevlar particles, the same material used in bulletproof vests. Super Radiator Stop Leak also contains corrosion inhibitors compatible with both conventional silicate, and extended-life organic acid coolants.