We used an old electric oven that was saved over from a tornado damaged house. Got a powder coating system from Eastwood.
Built a frame that I could hang parts from.
After spraying a heavy coat of powder on a bracket we cook it in the oven for about 30 minutes at 400 degrees.
Had to do some experimenting, how much powder, how long a cook time. But in a short time, the results turned out great.