Over coating metallic paints

Thanks Andy. I'll go the airbrushed route.

Sounds like you're using enamels on top of the silver as well. It would be best to spray the second color coat on with an airbrush if you can. When you brush the paint on, it's usually much thicker than airbrushed. So, the solvents in the enamel paint being brushed on "eats" into the exsisting silver and smudges with the brush strokes. I doubt a clear coat would help either. If you have to hand brush on the second color, I would recommend using acrylic paint. Acrylics wont "eat" into the base coat. Hope this helps...

Andy