Manifold Repair

I had manifolds "ceramic" coated by a shop that has been around forever. They put special coatings on aircraft parts, race car parts, military, anything you can imagine. I told him I wanted them to look like new cast iron. "No problem, we do it all the time", the owner said. Well they did look great, just like brand new sparkly cast iron. But it was a matte finish, and therefore porous. So the moisture could still get to that rust-prone cast iron underneath. And after a while, the rust came thru in spots. Moral to the story is do not get a matte/flat ceramic coating. Make sure it is glossy and therefore has what I'd call a "sealed membrane" on it.