Cessna paint shop
I worked at the Cessna Wallace division paint shop a looong time ago. We didn't remove any control surfaces for painting piston twins, turboprops and biz jets. They were anodine/anodized and primed, then test flight, after that paint, bake, and deliver. We used big pressure pots and a heated booth with a waterfall in the back to collect over spray. That was before HVLP.