Re: Can you still get Perfect Seal?
Yes, but frankly I don't use it much on gearcases. I use grease most places that call for it regarding sealing surfaces with O-rings. When I press seals in, I use red loctite. New gaskets don't need it unless the part surface is damaged. It does provide a fair anticorrosion coating and also makes a great never-sieze compound.
Johnnyrude and Merc dealers are the only ones I know that can get it, and few stock it. But a small container of it will probably outlast you if you don't do this for a living. It's also a great thread sealer around fuel and oil, and water you don't drink it.