Some of the white paint on my R3-SL bubbled and peeled on the top tube. Any suggestions for touch up paint? Thanks

i use nail polish, and model paint.  Most of the time it comes out good, but sometimes seems soft after drying.

A 1/2 pint can of white gloss enamel Rustoleum from Lowes or Home Depot. A much larger amount than I need but that's the smallest size. This paint is meant for metal and since my frame is aluminum I wanted to make sure its integrity is maintained. Also, it's a perfect color match to the 2009 S1.