Sorry for the hiatus, but the Mustang Coupe took a lot longer than I expected after several unanticipated setbacks. But, it is done and sold, so back to the wagon. In case you were interested, a couple shots of the '65 Mustang Coupe below!
We had some unseasonably warm weather, so I got out on the driveway to continue work on the body. I'm now using a products recommended by the shop that painted my Mustang: UPOL. This filler does have fiberglass in it, and seems to be harder to sand than Bondo, or the Eastwood filler I have previously used. On the plus side, it doesn't tend to build up on the sandpaper like the other fillers did, and I like the way it finishes a little better.
With a little luck with the weather, and available time, I hope to get this into primer shortly. More posts as time permits!