 Your vehicle is one of the more expensive purchases you make, so take care of it. If it's worth owning, it's worth protecting. You can learn about the many different protection products available from NHOU at nhoilundercoating.com. K-Seal fights the most difficult cooling system leaks, including head gaskets and engine blocks. Now there's K-Seal Ultimate, featuring 33% more sealing power than original K-Seal. K-Seal's unique formula works with all water-cooled engine castings, including aluminum.