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I know what you mean about the mono-midsole but I'm pretty happy with them. Lunar is obviously really flexible, so it'll be interesting to see how it holds. Seems like all customisation paint is acrylate-based. So water soluble initially then supposedly flexy when dry. I used the sneakersER midsole pen. Very easy. Supposedly specially formulated for midsoles but wonder if it's any different from leather paint.
Not the biggest fan of unicoloured midsoles on fkr's tbh, because they seem to lose the 'racey' illusion they normally have.
Did you just use Angelus paint? If it doesn't hold you might try an alcohol based marker.
I haven't sprayed on the swoosh or text yet, that's just Photoshop. I did remove the original swoosh as good as possible up front though, but you can still slightly see it.