 Coolant leaks can be tricky as the cause may be any of a number of problems. K-Seal is a one-step, permanent, multi-purpose system for coolant leak repair. We recently sat down with Mike Schlupp, managing director of K-Seal International. Mike talked about a number of different symptoms, including coolant loss with no apparent leak. Well, this points to a failing head gasket, which, if left untreated, can lead to serious engine damage.