Sometimes, replacing components in a leaky cooling system just isn't a viable solution, especially when cost is a concern. That's where K-Seal comes in to save the day. Touted by many as one of the best-kept secrets in cooling system repair, K-Seal utilizes ceramic micro-fibers and copper to fill low-pressure areas in your cooling system, effectively sealing and welding itself to the leaky area. K-Seal is guaranteed to repair coolant leaks in your engine block, cylinder heads, heater core, freeze plugs, radiator, and water pump housing or else the company will replace the bottle or refund the purchase price. With a guarantee like that, we feel that it's definitely worth a try if you have a leak somewhere in your cooling system.