Cometic Gasket states its head gaskets are made out of Multi-Layered Steel, or MLS. A one- thousandth of an inch thick Viton rubber coating is applied to the outer layers so that the gasket has to be installed with no sealer. The company strongly recommends not to use sealer on the head gasket.
Cometic Gasket manufactures a variety of gaskets for exhaust manifolds. These are also leak-proof and can handle the pressures developed by the internal combustion process. The company also recommends not to use any sealer on these gaskets.
Cometic Gasket has the capability of making any gasket an engineer wants. No minimum orders are required, so even one gasket can be manufactured for prototype applications.
Cometic Gasket states no special torque settings are needed for their gaskets. The recommendation is to use the manufacturer's specifications for all torque settings in an engine.