My freind has a Weiand blower, neither the blower or the intake has a coating on them. I asked him if I could clear coat a polished manifold. He said he tried this but it turned gray after a while. He uses "Hoosiers Aluminum Polish" seem's to add a protective coating. The stuff, I think, is made in a bath-tub in Indiana, smell's like lighter fluid with possible a fine pummis added.