I ground out the green stuff, it seemed like it was just filler, like the finish putty I've used before. None of the repairs that had this stuff in them were deep oddly enough, and those that were, had a green fiberglass material (much darker than the other stuff) in them and you could see the fiberglass strands, so I left that stuff. I filled the holes and really low spots with the high density filler and sanded that down. I then put a skim coat over that and will sand it when I get home. I'm sure I'll need one more skim coat though.
One area I have no clue how to fix is the door gaps at the top of the fenders. The gaps open up about halfway up from the belt line and get worse at the top of the door. Not horrific, but not right. In looking at them, if I were to close the gap, the fender is out farther than the door in that area and closing the gap would make it much more obvious. Plus, if I changed that corner of the fender, the line with the hood would be AFU. So, I think the gaps are going to have to stay like they area since I'm not going to break and reglue the fender at the firewall...
I use a file to knock down the ridges from spreading the filler (I'm working on my technique to limit those!) before sanding...
The fender on the drivers side sits quite a bit higher than the door, so there'll have to be some work here....
Oh, and working on cleaning up the headlight hardware too...