I'm partial to the aviation goop; I've used it successfully on a number of lycoming and continental rebuilds between the case halves...and besides having a BIG can of it, it somehow lasts for 2000 hours (most of the time, if you follow the case sealing directions religiously). On aluminum, I prefer the non-acetic acid RTVs that they have out there, and of course, there is proseal (which we use on wet wings to seal the joints and fittings) and high-temp RTV for areas that get hot. I know Wickens doesn't like Hylomar anymore (there are better solutions).

I think the key is use it sparingly, thin bead, smooth out...it's just meant to seal, not make up gaps where precision manufactured parts should require minimal sealing; that's what the neoprene/cork/synthetic stuff is there for (of course, that includes the head with its copper cylinder seals...)

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