Most 'ceramic' coatings are little more than paint, even from the service places that offer the coating as a service. One of the few that is an actual, thick .015" ceramic coating is from Swain Tech.. It has a rough, sand like finish and only comes in white. It is not a Glamour coating, but a real heat reducer. You can paint it with header paint if you don't like the white.. I did my Datsun header and intake, you can put your thumb on the headers while it's running for a few seconds easily before it's too hot...
Mild steel cannot take the thermal stress from the extra heat/cool down cycles that will occur with wrapped headers, regardless of moisture or rust they will eventually crack.... Only stainless or exotic metals like titanium and inconel can take that cycling.... The only problem is if you have a beautiful set of SS or titanium headers, do you really want to hide them under header wrap?
EDIT: Dug up a few pics of the Swain Tech Coating, White as delivered..
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After paint: Black Header Silver Intake...
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