prep work on a barrel of a gun

I am doing a barrel and receiver for a shotgun and was wondering if anyone could help me with a question!? Is there any solutions or anything I have to put on the bare barrel? I have to sand it due to some rust on it and I will degrease it when I'm done. I am using One Hit Wonder/or Kansas Hydrographics paints but just want to make sure I'm not missing any steps.

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