I would seal it with a light coat of that Pearl White rather than hitting it with Enamel Clear. Because the Gun Metal is Lacquer again, and you're going to wind up with a serious paint reaction once that Gun Metal hits that Enamel Clear Coat. If you want to use a clear coat to seal it, then paint more lacquer, you're going to need either the Testor Model Master Lacquer Clear or Testors One Coat Lacquer Clear.
If you had an airbrush you could get a jar of the Tamiya Gun Metal (X-10), that's in their acrylic line, and that could easily go over either the enamel clear, or lacquer paint without complications.
got it! i was gonna do the pearl white route, but i actually just found an old can of testors clear gloss lacquer overcoat. and just because i am short on money right now, would it be OK to use the blue 3m painters tape and then coat over it? or should i just honestly wait till i get that prestigious tamiya tape and coat over it?