My question might fall into what Wes calls "what the manuals don't tell you but every good mechanic already knows". I'm challenged in that department

Should I mate them dry, or would it be good to use some Permatex in between them? Seems to me like some sort of seal might be a good thing, at least for corrosion control? I saw no evidence of a sealer when I took it apart.
Your advice always appreciated!