Rislone Block Seal Permanent Head Gasket Fix is a simple and cost effective solution for sealing coolant leaks in head gaskets. It contains sodium silicate sealants and various sized sealing particles designed to penetrate cracks and gaps in gaskets and surfaces and harden under extreme temperatures to permanently stop coolant leaks. Once hardened, Rislone Head Gasket Fix is generally stronger than the standard head gasket material. Head Gasket Fix will also help to seal leaks in cylinder heads, engine blocks, heater cores, radiators and welch plugs. The simple 1 step sealant is compatible with most colours and types of coolant as well as cooling systems only filled with water, so flushing isn’t necessary.

Whilst this product is designed to repair minor issues, it may not be a suitable repair method for moderate or large issues, and may cause further problems in some circumstances. Before use, if you are unsure please check with your mechanic to ensure that this product provides a suitable repair for your issue

Dosage: One (680g) bottle treats cooling systems from 5.6 litres to 15 litres.