If you're looking at ceramic coating, HPC in leongatha is the place to go, they have a pickup and delivery service and is considered one of the best in Australia. I used them to do my exhaust and inlet manifold.
I have herd some very average reports about Jet hot.
I had my exhaust custom made. I gave him the chassis and body separate so he had plenty of room to work. Came up a treat.
http://www.hpcoatings.com/hipercoat.htm