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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?

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Note that there is a gasket that goes between the catalytic converter and headers enter image description here

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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.

https://www.amazon.com/s?k=high+temp+anti-seize&ref=nb_sb_noss_1

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