I was sure I replied earlier but ??????
Permatex is classic, and smells great! If I recall OK, it's a shellac, and you use alcohol for cleanup.
However, the old stuff has to be scraped off (another ritual of old), and you have to be very careful with all the aluminum parts. I don't use it on them - too easy to gouge the metal.
Nowadays, there's a lot of parts where they use RTV silicone instead of any gaskets at all, if you believe the manuals.
Some of you service techs tell us about this!
How can that soft rubbery stuff take the place of a sturdy gasket?
At any rate, assuming it works, with machined surfaces, if you go in there and use shellac & then scrape it later, I would assume the silicone will never again quite do the job anymore, because those close tolerances will be screwed up by the zealous scraping of the putty knife / gasket scraper.