Generally for warm colours - reds, oranges, browns, etc., you'll want to use a gold base coat. For cool colours, blues, most greens, you'll want to use a silver. Then you can put a transparent blue over it to get the candy effect. If you can get your hands on it, you may want to mix some pearl powder into your first layer of translucent blue. Expect to put on a few coats of clear blue to get to the colour you desire.