I'm quite sure the problem is sanding/polishing thru paint layers. One spot had a deep dot - probably a bubble that dried. I tried to sand it out w/800 and by the time it was gone I could see edges of paint layers.

So the question is - how do you take care of scratches or bubbles or other flaws short of a total recoat? I can't imagine ever being able to paint a whole panel without some sort of flaws. Are touch-ups possible?

Bob