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This video shows how I powder-coated the steel housing of the 4th Axis that I made.
My air supply is filtered with this Coalescing Filter and desiccant dryer combo, which supports the high airflow that I need for plasma cutting but it’s larger than would be needed for just doing powder coating. I added a small pressure regulator and replaced its gauge with a low-pressure 0-15 PSI gauge so I can accurately adjust the pressure to about 8 PSI / 55 kPa.
For masking the areas that I didn’t want to powder coat, I used Polyester Hi-Temp Masking Tape.
The video shows the Temperature Controller that I used along with a Solid State Relay to control my kiln. These are widely available and most any of them would work for an application like this, provided that you get a relay able to handle the maximum current of the oven.