K-Seal HD permanent coolant repair is the brand that motor stockists recommend with confidence to their customers with buses, coaches and HGVs. K-Seal HD can be used in the workshop, on the road or on site so the vehicle can be put back into service almost immediately, avoiding expensive downtime. Always have a bottle on standby for every vehicle. Fixes most leaks in all types of water cooled engine including cracked heads, head gasket failures, cracked blocks, radiators, heater cores and water pumps.