I was convinced you needed a full spray booth for a proper clear coat until I saw a mobile repair guy's setup in a parking garage.
This was in Phoenix, outside a corporate office park. He had a pop-up tent, a serious respirator, and a high-end HVLP gun. The finish on that BMW bumper was flawless, no dust nibs at all. He said the key was a 3-stage filter on his air supply and only working super early in the morning when the air was still. Made me rethink what's absolutely necessary for a quality job versus just ideal. Has anyone else pulled off a showroom-level finish in a less-than-perfect environment? What was your trick?