In the midst of replacing my Catalytic Converter on my 03 Nissan 350z, I have taken off the Catalytic Converter to reveal a pretty rusty mating surface between the two components. My question is what is sufficient for cleaning this area up. So far I used some parts cleaner, and a wire brush to get off the lose material (as pictured below). Is it wise to also follow up with some high temperature paint (primer/topcoat)? Perhaps a small amount of Nickel/Copper Anti-seize?
I use High temp anti-seize compound, Nickel compounds are best but more expensive than copper, which will do in your case unless it is turbocharged, then use Pure Nickel compound.