I taped off the grey and the area that will get blue so I could spray the white, but this doesn't involve laying tape line on the seam between grey and white. that is done and waiting underneath.
Then I taped off the white and sprayed the blue. Again the 2 inch strip is protected and the taping is faster and easier. it is still a pain.
the white is solid color Matterhorn White. The blue and grey are metal flake colors. Metallics. You can still get metallics in single stage urethane in car paint, but not in aviation paint. You have to go base coat clear coat to get metallics with aviation paint.
And notice I have discovered the head sock. Now this is a nice way to paint. Love it.