Just need some advice on the above really. Im gonna spray some high temp on it and then wrap it. However I want to shotblast first as I can't get rid of all the rust thats occured. Will the manifold be okay to shotblast or will it degrade the metal in anyway. Secondly am I right in saying that I shouldn't get the underside done where the gasket goes and just work on that with a bit of wet and dry?