So once I got the gap straight, I figured I'd better get the metal protected from sweaty hands and the occasional "poster board spill". So I went on down to Ed's Auto paint and he turned me on to some really great stuff. In the past, I've used regular body filler to skim coat panels but I could never get it on thin enough so it took a LONG time to block it all back off. This stuff is not a heck of a lot thicker than primer so it's easier to put it on real thin. It also sands very easily and feathers out beautifully.
This stuff.