Dan, I also use Dupli-Color primer, white sandable under Tamiya paints. I think the white helps colors pop. I used it under the Tamiya candy lime on the VW Bug gasser in my avatar. I also just used Dupli-Color clear over metallic Tamiya paint, and it came out fine. It will be polished when dry. I also have tried the Testors Lacquer system as Steve said, with great results, but those paints seem hard to find locally. The drying time with these kinds of paints, especially with a dehydrator, has me sold!