None, just alodine
I am personally a fan of no paint on baffles. A nice light Scotchbrite brush finish and Alodine is my personal preference. In many years of building/rebuilding baffles, the painted ones often (not always) end up scratched, chipped,flaking and messy looking. Baffles are crack magnets, and much easier to see/repair when unpainted. The Alodine will give it a light goldish tone, and can be easily touched up.