Safe to use with all types of glycol anti-freeze/anti-boil coolants and water based corrosion inhibitors. Nulon Permanent Head Gasket Repair with DuPont™ Kevlar® fibre and liquid resin provides the ultimate strong long lasting fix. Formulated to permanently seal head gaskets and engine block leaks without costly mechanical repair. This unique formula with microfibre technology seeks out and plugs small leaks and cracks that cause coolant loss, loss of pressure and overheating. The DuPont™ Kevlar® fibres combined with the liquid resin interlock and harden, creating a permanent long lasting watertight seal. Nulon Permanent Head Gasket Repair can be safely used in cars, trucks, vans, utes, and light commercial vehicles. Safe to use in plastic, aluminium and metal (copper / steel) radiators, heater cores, gaskets and welch plugs. Safe to use with all types and colour of glycol anti-freeze/anti-boil and water based coolants.