the fading issue is one that plagues most candies, UNLESS you use a clear that contains UV filters,, such as a two part Urethane clear, this will prevent a great deal of the fade.
What Randy says about the dry flake is the hot ticket, you can mix your own that way in whatever color you want. Just make sure you keep enough for repairs,, that is unless your a masochist like me, and do paint jobs that cannot be repaired,,,, sigh,,,