Scott,
Not a bad seam, just a lot of holes from bubbles. He brushes on a layer of epoxy on the out side of the seam to really strengthen it. I just knocked it down and filled any low spots. It took longer for the filler to set up than to sand it down. I just covered the whole seam in one swipe.
The green Bondo has chopped glass in it to fill the chips. It is strong and can be sanded to shape as I did on the fillet tip. It harder to sand so you can creep up on the profile you want. The NAPA filler sand like balsa, almost too easy.