BG Universal Cooling System Sealer repairs coolant leaks quickly and efficiently. Modern engines produce temperatures that are higher than their own metals can handle. This makes the coolant system integral to the proper operation of a vehicle. When coolant levels are low, it can wreak havoc on a vehicles engine, causing it to overheat and eventually break down. BG Universal Cooling System Sealer is a safe and efficient method of sealing leaks in the coolant system. Added to coolant, it flows through leak points in the coolant system, quickly and completely plugging them. Refined organic fibres carry sealer particles that rupture with fluid motion. As coolant flows through the hole in the system, these ruptured particles build on each other around the hole until it is completely plugged.