you are probably right about hiding imperfections same reason drywall usually has texture. I tried to take some pics of car but I did not force flash and it was inside garage and you can't see any detail at all. Perhaps I was a little hasty in my sanding. I was was just really let down when I thought i had something that I did not (ultra smooth primer) I am still a little unsure the best way to sand primer in prep for first coat paint? literally. I'll a pic any way maybe it will show enough detail. Pic of trunk after some sanding.