I have heard numerous stories that fluor paints tend to suffer from flaking more easily; of several Tamiya paints I know this from my own experience, too (for example adhesion of fluor orange is terrible). Which brand of fluor yellow did you use?
To get better adhesion I usually sand my bodyshells. It's not a perfect solution (particularly in creases and detailed areas), but it does help.
Also, just thinking out loud here, maybe the adhesion of the fluor paint to another paint is better? If so, it could help to spray a clear coat on the inside as a compatibilizer?
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