I'd like to add a little trick that I mentioned in another post here so hopefully it will help someone with booth cleanup and color changes.
I was admiring my handy work one day when I realized that it was going to be a royal pain to clean the excess powder from the inside of my booth. Even though it has a filter and fan, there would still be a pretty good amount of stray powder in the corners. I thought that I didn't want to waste too much powder so I didn't want to rely on a vacume, so I decided to use the closed circuit of the process to reclaim the powder. Now to get to the point... Electricity is your friend. I went to my local Home depot and picked up a plastic spackle tray... It's about 10" long and tapers down from 4" wide. At the bottom I put a piece of angle iron with a bolt attached. I used a jumper lead(wire with alligator clips) to complete the grounding circuit. The parts hang pretty high in my booth so the additional ground doesn't pull powder away from the parts. When the still charged powder falls to the bottom of the booth it's attracted to the grounded metal piece and sticks to it. When you finish coating you just disconnect the jumper and set the tray aside and let it discharge then do the rest of your clean up. A word of advice from someone who spent many years working in shops...Always clean up when you finish your job, you don't want to face a cleanup when you go to start your next job.
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