I've used Eastwoods Hi Temp Silver on a set of used Hookers. I sandblasted them, dunked them in degreaser, brused a coat on, had them baked at a local powder coaters oven, applied a 2nd coat and had them rebaked. Initial start up was odor free and they lasted for 3+ years until I went to TTI's. They did have a little rust where the collectors were welded together. Easy touch up too!!!

The key here is to blast them clean and degrease them. Painting over just sanded tubes ain't gonna cut it.