Install any gasket that gets exposed to manifold vacuum DRY- - - -no sealer whatsoever. If the flanges aren't flat enough to seal dry, there's no sealer made that will help. If they are flat, sealing them is a waste of time and effort. Ditto for carburetor flange gaskets- - - -never use sealer of any kind.
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!