After his appreciated entry re ceramic coating exhausts and a phone call from Cobham Cobra I have taken up John's kind offer to contribute to your thread. The ceramic coating treatment we carry out at Camcoat is to first of all sandblast all surfaces back to bare metal using controlled processes. We then apply a smooth, hard ceramic called TLHB to the insides of manifolds, pipes and repackable silencers (obviously not to catalytic converters). On the outside we apply a base ceramic(HHBK) followed by either Black Satin (for competition cars and maximum thermal insulation)or Cermakrome (a highly polished finish which has excellent anti-corrosion properties). It has taken several years to develop these coating processes which provide excellent insulation,stay looking good and do not damage the components. We have a new website www.camcoat.com on which you can see details of the whole range of coatings and still link to the earlier site. Please feel free to post any questions or contact me (Peter Carter) directly.