I dont have the coating on mine. I sanded the headers, then put on black B-B-Q paint on it. It hasnt rusted yet, and is a quick touch up if it does. The bbq paint is durable paint, and very cheap, I couldnt afford the extra 300.Can. for the coating. Just keep on top of the headers, if they start to rust, sand them and re spray them,lol.
Rick