Valve cover gaskets and RTV

Good evening,

On rubber gaskets, you never use RTV. It will cause the gasket to move and you will have a leak.

Install it dry.

Roy

With a rubber gasket you don't want to add RTV as it will act like a lubricant and cause the gasket to squeeze out of place, On the molded ones that go into a groove in the cover you don't use it because it will cause the gasket to torque unevenly and leak.
The only time you might use RTV with a rubber gasket would be if there is a seam under the gasket and the manufacturer calls for a small amount.