Tho, not a pro. More of a curious experimenter. I've been using a HF type powder gun for a couple of years.
I just do mostly small parts. Less than 20" and aluminum parts seem to do well..
I did "Chrome" powder on my aluminum windshield posts, carriage lights and headlight stands along with many odds and ends. On the "T" bucket. Came out great, using basic powder coat procedures.