I agree with Jerry. Maybe others have had better luck but I sandblasted my exhaust manifold down to bare metal. I used POR high temp primer and then top coat. It lasted about 6-7 months before it started to spot all over the manifold with rust. It didn't take long to spread across the entire manifold. The intake manifold is different. It has held up very well.
Last edited by dgrinnan; 03/08/2022 1:45 PM.
