I'm kind of like Porcelain Enamel 'Old School', I've seen it on restored Packards, Dusenburgs. I haven't got a clue as to how durable it is. There are other coatings. I haven't had it done yet. There is an advertiser in the Inliners Newsletter, Caps Brite Hot Coatings, there Fresno, CA. They have some prices on there web site. here's the link;
http://capsbhc.com/I gooogled 'cermakrome coating', and got a few results.
Larry