Jet-hot coating and coatings like them are a ceramic based coating. They are very durable and in some cases, help with heat.
Powdercoating is more a dress up item. It looks like a painted surface but is much more durable and can be wiped clean without removing it like paint. The part does have to be heated to 360 degF for the powder to adhere and melt. Anything metal can be powdercoated.