The side exhaust pipes and tubular exhaust headers on my 289 FIA Cobra (UMC # 9299) have begun to acquire a pattern of tiny points of brown (assumed to be rust) which are beginning to give a faint but unsightly brown haze appearance to the once beautiful silver ceramic coating. What is the suggested method of repair and if it is to respray with a ceramic coating, can Jet-Hot or some other ceramic coating process be sprayed on over the existing original UMC build ceramic coating? Thanks for considering this.