[Aussie_in_MO]

Hylomar is available from a ton of different sources. I've been told (but I'm not a chemist who can actually confirm) that it's the same formulation as Hondabond, Yamabond etc.
I've used it to seal up cracked intake boots, added to old (unavailable) carb bowl seals so I can reuse them etc.
Most recently I've used it to install the oil separator plate and oil pump on my Subaru engine rebuilt project, will also be using it when I reinstall the sump.
The petrochemical resistance (fuel and oil) is a huge advantage and since it doesn't completely cure there's no concern about chunks of it getting in the oil and clogging up a filter screen like a glob of traditional sealant can.