In addition to Phil's answer that the metallics are not fuel resistant, I can add that Rusto clear is not either. For that reason I have not used the RO clear, and opted instead for Clear Lustrekote. It must be laid on in several dustings or it will ruin the color coat, but once it's on the front end where fuel is likely to get, it's bulletproof. L'kote clear is heavy, so I never use it on the rear of the plane.
Lately I've switched over to Duplicolor Perfect Match acrylic lacquer(not fuel resistant), and it plays well with clear dope and Lustrekote perfectly. And it dries in hours, not weeks. For primer, the NAPA DC-540 works best with the Duplicolor paints. The Duplicolor acrylic enamel is fuel resistant, dries very fast, and is slightly heavier than the acrylic lacquer.
Rusty