[quote="blizard"]There are several: https://www.google.com/search?ei=YiBkXJ ... WvWxJhszyM
quote]
For a new elastomer or cork based gasket, that's true. For a new paper gasket it's not, but it's generally useless. For and old, hardened elastomer, cork or paper gasket it's not. Of course, you only lightly smear the gasket, as it has adapted to the mating faces already.
Ciao, Kai