After ordering the kits to fix the carbs, the fuel pump, and the impeller. I forgot to get sealant. What kind(s)should I use. I know some of the gaskets don't need anything added, but some do. Is there a gasket between the lower unit and the shaft? The manual I got is not very detailed. Any gotchas with the lower unit removal? 1989 40 Evinrude. Thanks for all the help. Chris 