It has been my experience that when a colored metal flake has some silver flakes in it is because someone went too far wet sanding or buffing. Now some jobs combine flakes of different colors with good results, but if most of the flakes are one color with patchy spots of silver, that's how it usually happens. Most won't notice, but if it bothers you, then adding tint to the clear is effective to mask the silver spots. Looks like your cvz is coming out quite nicely, engine cover looks fantastic.