i would replace a gasket with a new gasket if it were me. I was also introduced to permatex anarobic sealer by mr resistor on this forum. it's a gasket goo that you can use on gaskets to help them seal but not stick to the covers/cylinder heads or in a case of where you would use just a gasket type of goo by it self.It works really well, and you don't want to or need very much on the surfaces your putting together.