there are specific high heat paints in an arrangement of colours that will work and the whole powdercoating thing might work but definatly look into it the high heat paint that is good is the stuff for headers on vehicles
I think there is some stripping/prep involved. As well as a bit of technical knowledge involved in when it is appropriate. Arm yourself with knowledge. I'm also curious if you'd be required to have some air control systems in place for particulate matter and for fumes? (Similar to a paint booth?) A question worth finding the answer to.
Here's an old article specific to powdercoating cycles.