Hey dude...

what icek said but I must admit I tried once with enamel and worked great!!!

Just take a cotton swab, those with the strongest tip you can find and dip it in the most gentle thinner you can find for enamel....go "scratch" the part where you have the unwanted paint,then take the compound and polish that part, which will be a bit foggy after the treatment with thinner, and work hard until you get it shiny again, then take future and cover it...

that's it!!!!

I've done it twice and with care works great!!!

Cheers