Two days later I taped off the 2" stripe so I could paint the blue. I wait two days before putting tape on the grey because one time the tape made tracks and I had to repaint. Waiting two days fixed that. Plus I use only 3M tape, not house hold tape which seems to make tracks.
Then I taped off the 2 inch stripe and most of the rest of the wing and painted the blue.
I rotated the wing back n forth to spray it in the mostly horizontal position. I did not spray it standing vertically. I used a second 2 inch tube pushed into the aft holes to hold in in position.