Painting headers?

Did you use the Por-15 primer?

I did some manifolds last year, but haven't started the car yet.

I sandblasted my manifolds as best I could.

On one, I used Rustoleum rusty metal primer, on the other- just the Por-15 "Metal Mask".

The color of that metal mask is dead on for cast iron. It's so close, it can be difficult to tell what's not been painted yet. I obviously left some areas with too light a coat, and there is a small ammount of rust in a couple of places, on the one I didn't primer.

How long ago did you do this, and how are they holding up?

I did a cast iron water neck on another car over a year ago.
I've driven it a couple of tmes, and it still looks great. No primer there, either.