Quote:
Originally Posted by Terry Burtz, Calif
Permatex #2 is not just another silicone.
There is no silicone in Permatex #2.
Permatex #2 is a sealant that is alcohol based.
Silicone based sealants were developed during the "Space Race".
Permatex #2 was developed during WW2 to seal aircraft engine interfaces where precision mating surfaces needed to be sealed, and the variability of a squished paper gasket was unacceptable.
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Don't think anyone said that Permatex #2 contains silicone, but "Ultra Black" sure does. Ultra black is a modern day sealer, #2 is old school. Both have their place.
Something interesting that lots of guys don't realize, is that silicone sealants and RTV sealants are a very different composition, and you should not use plain silicon sealer around oily stuff, it won't hold up. RTV is recommended for automotive uses, and will withstand that environment.