Cheers fellas, thanks.
Glossed the lower surface today and painted the props and spinner, started with the Dark brown on the rear of the blades, masked them off and then sprayed the Silver, used the Citadel Mithril Silver, wasn't happy with one blade in that the surface wasnt as smooth as i would have liked and showed some imperfections, so reluctantly sanded it back got rid of the marks and resprayed it, much better! ...pain to have to clean the silver out twice though...