I'm with JMK on this. The odds are if you try to buff/sand down the re-paint you will find they used a primer beneath the top layer of color.

That being said I'd probably try to sand down a very small patch and keep my fingers crossed. Who knows? You might get lucky and if you don't, a dab of touch-up won't be as noticeable until you get the chance to redo the wing.

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