John,
If the non-painted area is at the end of the female ferrule, you can use a strengthening end wrap, starting at the very edge of the open end, to cover the oopsie. Since the wrap at the end of the ferrule is typically 2x or more of the ferrule diameter, it should cover a 3/16 " area. Then you can use a fresh bottle of the Testor's to touch up the rest of the edge.
If you need to refinish the bare area, I would let the finish set up/cure for at least a week before trying to refinish it - even though it was cured when the epoxy was applied, it may have softened due to the contact with the uncured finish and will require time to re-set up. I've had pretty good luck with both enamels and acrylics, but learned the hard way that the instructions on the can aren't kidding when they say wait at least 5 days before another coat

. Same applies to wrapping over the refinished area - give it a week before you wrap and finish it. It once took me 3 weeks to get a white blank right - got some really neat crackling/crazing effects on patches of the blank (more than once)

, but they weren't exactly what I had in mind for that particular build!
Best of luck!