For nearly 50 years CRC has been trusted by technicians drivers and distributors for high-quality products. CRC Permanent Head Gasket and Block Repair (32 oz) is an automotive additive designed for cars trucks and other vehicles. This cutting-edge product uses Nanotechnology to permanently seal cracks and crevices providing a strong bond that hardens to the surface for long-lasting performance. Ideal for head gasket and block repairs it ensures reliable sealing and enhances engine performance. Trusted by professionals and DIYers alike.