If you are looking for a simple DIY pour in head gasket fix that will save you thousands against a mechanical repair then look no further than Steel Seal head gasket repair. Steel Seal Head Gasket Repair creates a seal (as the name suggests) that will set like steel, this will repair the leaks in the cylinder head gasket permanently. Steel Seal can be used in all types of vehicles and engines with a water cooling system regardless of whether your vehicle is petrol or diesel.