Ceramic coating

@oldkimmer, I believe the piston coating you're referring to is actually a "dry film lubricant" which can be applied with a regular airbrush and cures in a simple toaster oven.

Cerakote high temp ceramic coating, mainly used for exhaust applications, is also a liquid but is generally applied with an HVLP paint gun (using a smaller tip than you would to paint). It's typically good to around 2200 degrees but not all ceramics are created equal. A couple colors can be tumbled once they're dry to increase the shine (i.e., to sort of replicate chrome) but none actually require an oven -- they just dry in the open air over five days whether they're still hanging on the wires you suspended the parts with to spray the coating, laying on your shop floor or already installed on the car.