The lighter colour first buddy, other wise the dark colour shows underneath!
So for the Skyline I painted the yellow first, then the black.
You must peel the masking tape off as soon as you can, say within 5 minutes, otherwise the tape pulls the paint off with it!!!
Here is another example.
I painted the white first, then masked the ribbon off and the top section. Painted the red, then masked it all off and added the blue.