I never paint my lexan wings, I always keep them clear, very rarely do I see anyone paint a wing in my area. Typically they put the protective film on top with the intent to paint the bottom of the wing and if I were to paint a wing then I would reinforce it with E6000 glue to prevent the paint...
It takes a lot of skill to use liquid mask, I have always cut it too deep which scores the lexan and then the lexan cracks where I scored the lines :(
I will also use a toothpick to scrape away any paint that bleeds on the lines before spraying an overlapping color, though when that happens...
generally you want to paint the darker colors first, only exception is if you use a white backer coat, then you can spray a dark color without bleeding.
If I was painting your scheme, I would paint the red stripe first (back it with white), then the silver, then back the silver with white while...