The Permatex Optimum Gasket Makerline includes a new generation of high-performance gasket makers. Optimum Grey and Optimum Black Gasket Makers are designed for high-stress applications. The Optimum Grey Gasket Maker is an RTV silicone gasket maker which provides adhesion, and is capable of withstanding high torque loads and vibration while offering maximum temperature resistance up to 700 degrees F. The Permatex Optimum Black Gasket Maker is designed for use on lighter and more flexible engine components. Its advanced formulation and patented adhesion system makes it stronger and more flexible, and gives it the ability to withstand dynamic changes in assemblies with dissimilar metals, thinner, lightweight alloys, and wider spread bolt patterns.