Just a follow up. I finally got out and fixed that small run/sag in the paint.
Before and after shots of the run/sag repair. Took about 30 minutes to fix this.
To fix this problem you'll need to sand out the run/sag. I used 320, 600, 1000 and 1500 grit paper in that order. Be careful to not sand the edges which cut faster than the flat surfaces. You don't want to get down to bare metal which will ruin the job. Meaning you'll need to apply prep, prime, color and clear coats again.
Using small strips of sand paper confines the removal of paint.
I simply cut small strips for all the four grits I needed as shown above. Carefully hand sand over the run/sag to remove it. Don't remove too much clear coat. And use plenty of water to avoid clogs and paint balls.
3M rubbing compound available at body shop supply houses.
3M's rubbing compound picks up where 1200+ grit sanding leaves off. My last grit was 1500 which just makes the rubbing compound stage that much easier. I used a paper towel and elbow grease to polish to a mirror finish. This came out really well.
Problem eliminated. Nice smooth mirror shine. Looks great!
Don't feel badly about getting a run in your paint job. It happens from time to time. And it even happens to the pros. You just need to spend a little extra time to fix it.