Help prevent costly cooling system repairs with DynaGrip Metallic Seal-Tite. The scientifically treated liquid glass formula is designed to repair most cracks, leaks and holes in cooling systems. Seal-Tite also contains added copper to provide extra strength for long term repairs. It is suitable for use with all metal surfaces and ideal for repairing leaking head gaskets, engine blocks, radiators, cylinder heads, heater cores and even welsh plugs. DynaGrip Metallic Seal-Tite is not compatible with glycol based coolants therefore it is important the cooling system is flushed of existing coolants and replaced with water before treatment.