if rubber, usually a sealant is not needed, except at corners where there is a joining metal piece (ie timing cover etc). a thin smear of silicon (black oil resistant) can be used,
BUT if you overtighten when the silicon is not cured, you can actualyl split the rubber and it will be stuffed.
put on smear of silicon, tighten up to contact and maybe a _fraction_ more, then wait a day or two for the silicon to cure, then tighten to spec.
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