On older or used manifolds, we glass bead them, then wash with simple green, and then tumble the manifold. Depending on how long it is tumbled, it can look like new, or like the "Endurashine" that Edelbrock sells, or like Wade White's 3X2......there are some pics of the "inbetween" on his manifold on this forum and on the FE Forum. Any kind of paint or clear will come off eventually, and blasting only will make it a trash magnet. The tumbling closes the pores up and helps prevent staining. Brake parts cleaner and a towel will wipe fuel stains right away!