I'm working on a Nieuport 17 1/32 (Hobbycraft) kit and was painting the upper wing. I don't have an airbrush, but instead used a spray can of Tamiya aluminum, which worked well. However, after realizing the old decals were unusable, I tried to hand paint the RAF roundels on the wings. Didn't work out well, tried to sand it off the blue paint, along 2 layers of aluminum. I put a few bumps in the wing sanding and the paint is still clumping. Any way to remove all the paint, smooth it properly again and repaint?