If the canopy will be closed then I mask it, glue it in place, fill any seems around the windscreen, paint the interior colour first, and then the camoflauge colours. I d not remove the mask until the final matte coat is done. This provides a uniform finish. If the canopy is going to be in the open position, I paint it off the kit, but at the same time I am painting the kit, so I keep the paint colours consistent. I mask the open canopy and windscreen with tape.