The Liqui Moly Radiator Stop Leak is a high-quality cooling system sealing additive designed to quickly and effectively seal minor leaks, hairline cracks, and small coolant seepages in vehicle water-cooling systems. Formulated with a specialised solids dispersion suspended in a carrier fluid, this advanced leak sealer circulates through the cooling system and reliably seals small leak points without affecting system performance.

Suitable for use in aluminium radiators and modern cooling systems, Radiator Stop Leak is fully compatible with conventional antifreeze and coolant additives. The formula provides a permanent sealing solution while maintaining proper coolant circulation and heat transfer efficiency. It operates safely within the cooling system without damaging water pumps, heater cores, or other vital components.

Ideal for both preventative maintenance and emergency repairs, Liqui Moly Radiator Stop Leak helps prevent coolant loss, protects engine components from overheating, and supports long-term cooling system reliability. It is suitable for passenger vehicles, light commercial vehicles, and various automotive cooling system applications.