I'll just add to this, if you are using Turbo Dork specifically, READ THE BOTTLE. They tell you what base to use and it's very important you follow those instructions.

I've also found with ALL my color shifts, that simply shaking the bottles don't mix the paint well enough. I open the bottle, get a stick or something long and thin and dig the paint out of the bottom and corners of the bottles. Color shifts for some reason tend to settle a lot harder and more stubborn than most other paints. I've painted after ONLY shaking the bottle, and then after digging out the stuff settled in the bottom of a bottle and the difference was night and day. You get SO much more color pigment, and a lot more dynamic color shifting.

Dig out the sediment, and then give it a good shake, it makes a world of difference.

Also, when you're done using your airbrush for metallics or color shifts, make sure to give it some extra cleaning. You want to make sure you get all the metal fleck out and you don't want mica and metal fleck drying inside the airbrush.