I've used Permatex Super 300 for 50 years or so with few, if any problems on all sorts of paper and synthetic material gaskets. RTV makes sense if you're trying to mate parts without a gasket.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!