I'm not familiar with Profilm but this is how I would do it with Ultracote or Monokote.

First cover the wing from the spar to the trailing edge with white. Then cover from the spar to the leading edge with purple. Then add purple rectangles over the white to achieve the pattern you want.

I'm not a big fan of prejoining pieces and then applying them as a whole sheet to the wing. I tried this with Ultracote and got a little too carried away with the heat gun...result: one seam pulled apart so I stripped the wing and recovered.

Rich.