Can I spray transparent or candy colors directly on top of a metallic base or should I clear coat in between?

createx?

If so read up on the candies they are pretty specific in how to apply

Autoair. They're pretty specific about the base coat, but it's a bit vague about a clear between the base coat of metallic and the candy.

I would say not. Createx is a system and unless your cc is part of their system it prob wont work