As luck would have it, I ended up with a run in the paint while spraying the back of the guitar. It happened around the inside of the horn in the very tight corner. I might have been able to sand it out, but I don't think it would have ever matched, so I had to sand everything down and start over.
Ready to start over
This time there were no issues! The colour is a little hard to see in this picture, but the brown matches up nicely with the red on the front.