Good tips here. As stated, on a stripe that small it would probably be easier to shoot the white, mask it then shoot the overall color. I usually spray the first color, let it dry for an hour, then tape for the 2nd color. I never use an intercoat clear between. I imagine that that is done to prevent peeling the base when you remove the tape. An old timer taught me a trick to lightly stick the masking tape to my (clean) pants leg before sticking it to the panel. It takes just enough of the tack off the tape to prevent lifting the base when removed, but doesnt cause bleeding. I then shoot the 2nd color, then clear. And like mentioned above, if you dont want to see the step transition between the 2 colors, let it fully dry after 3 coats, sand with 600 (be careful on edges) and then reclear.