K-Seal K5501 Permanent Coolant Leak Repair adds a quick and permanent fix to coolant systems so they don’t result in costly repair bills. Just pour & go; K-Seal couldn’t be simpler to use. Just shake the bottle, add the fluid to the coolant system and run the engine as normal. K-Seal’s unique formula will seek out holes and cracks, and permanently seal them, with no adverse impact on the efficiency of the engine cooling.
Link: K-Seal