In general, I glue the gasket to the removable piece (valve cover, oil pan, water pump, etc) using any of a multitude of gasket sealers or adhesives.
Doesn't really matter WHAT you use, although RTV silicone would be my LAST choice. Silicone in aerosol form is a lubricant, why install slippery gaskets that will shift or squeeze out-of-position?
I've become very fond of Gasgacinch; but I still use good ol' Yellow Death (3M Weatherstrip Adhesive) or Permatex #1, or #2; and there's room for HyTack and CopperCoat and ordinary pipe thread sealant with Teflon. The pipe sealant--cheap stuff in a bottle with a brush in the cap--works great for steel shim head gaskets; or steel shim "turkey tray" valley pan-style intake gaskets.
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