Do sealant works on cylinder head gasket?

In general, it is not recommended to use sealant as a permanent solution for a failing cylinder head gasket. While certain sealants may temporarily stop or reduce external leaks, they are not designed to withstand the high pressures and temperatures inside the engine, and can fail over time.

Using sealant on a blown cylinder head gasket can introduce further complications and may prevent a proper repair. When a gasket fails, it is important to identify the root cause and replace the gasket with a high-quality replacement. This may involve more comprehensive repair work, but it will ensure a reliable and long-lasting solution.

If you suspect a blown cylinder head gasket, it is crucial to have the vehicle inspected by a qualified mechanic to determine the exact issue and get appropriate recommendations for repair. Attempting to fix the problem with sealant may lead to additional damage or further issues in the future.