Paint stripping started, unfortunately not far enough due to bad weather and the delays caused by disc brake conversion problems. Lots of hard work stripping the paint but finally got to the metal. The rust was tackled with the wire cup brush on the angle grinder and the metal scuffed up with a surface prep disc on the angle grinder. This disc is a kind of hard scourer thing which gets of any odd stuff and sands the surface to about P180. I then went over the metal with P320. Although where the wire cup brush had scratched the surface I had to use P120 first. Avoid the cup brush on good metal as it does more damage than good. The zinc primer didn't spray out my old gun, I guess because it was not thinned out as much as normal. The old gun has no pattern adjust. The new DeVilbiss sprayed it fairly well but caused a lot of atomisation and mist even with the presure down and the needle out to max (to the point where the knob fell off! :hehe. Hopefully with the filler primer and top coat it will be better. I now need to seam seal and touch in a few bits that were difficult to reach with such a large gun.