l'm no mechanic,but l've always found permatex to be great on most gaskets,& if silicone sealant is absolutely necessary keep it to a absolute minimum,l've heard many horror stories where someone's gone overboard with it & ended up with lots of black crap floating around in the internals.lts probably like everything, different strokes- some mechanics use a small bead of the stuff on everything & swear by it,& l know a few pig-headed old-skool mates in their 50's who wont touch the stuff,one says"they've been building cars for 100 years & survived for 80 years without using that shit!"
Daz.