All I can say is don't give up! I had a setback when I final sanded a corner right through to the prime. I didn't realize that 1500 grit sandpaper on a corner is disaster in the waiting. And like you, mine was where the two colors meet, so I had to feather and repaint both colors.

But I kept trudging along, and today I have met my golas: I set out for a 5 foot paint job for under $250, and I got an OEM equivalent paint job for a little over $300.00 including the body putty and tools.

Hate to say it, but you gotta bust out the sandpaper and primer and get at it again. But do yourself a favor and DO NOT HURRY!