I re-coated the two-piece cast iron exhaust headers on my Alfa Romeo with Eastwood Silver High Temp Manifold Coating. When I first painted them two years ago, the surface preparation consisted of running a wire wheel on the rusty cast iron. The Eastwood coating lasted well, though small rust spots eventually appeared through the coating. Last week, I cleaned the headers with lacquer thinner and applied another coat.
To keep the headers attached to the head, I used brass M8x1.0 hex nuts, new lock washers and new copper gaskets.