I didn't buy a HotCoat, I bought the HF "Chicago Electric" unit.. on sale, cheap.
Bought some Eastwood Bright Red, and some HF gloss black (also another mfg satin black and red that I haven't used).
I acquired an electric oven for free - throw-away.
Waste Powder isn't a problem.. just sweep up the "overspray".. just don't use the Shopvac (fine powder in suspension can be explosive).
The powder is non-toxic, non-hazardous.. just toss it.
If you're worried, put a pan or bucket or garbage can lid under the part you're coating, and you'll catch most of the overspray.
I mounted my air compressor over the oven to save space.
I bead-blast (or thermo-clean) the part first..
Mask with high-temp tape, silicone plugs, and aluminum foil as necessary.. then "fog" on the powder.. place in oven at 400F (IIRC)
Wait a bit..
Then admire the result.
And the finished product:
Block was spray-painted, but the motor mounts, valve covers, tappet/pushrod cover, intake, thermostat housing, front cover, accessory brackets, etc. were all powder coated.
Clean-up is easy. Sweep/wipe up excess powder and round-file it (or, if you're clean, set up a recovery system and you can re-use "wasted" powder).
Gun doesn't need cleaned at all. Simply remove the powder cup and put a cap on it, and box the gun back up. If you change powders, you just need to remove a screw or two, blow the gun out, replace the screw, and put a new powder cup with the appropriate color on.
No need to run thinner through it a few times, disassemble, clean, etc.
You can see the gun in this picture, next to the finished intake and the ready-to-be-baked oil pan.
Yeah, I should've done some "body work" on the pan to get rid of the dents.. but I didn't.