I've been working off and on on my pad between other things. I've never seen anyone post the back side of the fix, so I thought I'd remedy that now.
To do an area as large as in the pic, you need to remove the jute backing and use a small wire brush (toothbrush size) to really remove the jute in the areas to be fixed.
To put together sections of the outer skin I use black super weather strip. I hold the sections together using either blue tape or gaffers tape. This allows me to line up the front and then flip over the pad to reinforce and fill the back. Using a bean bag works to hold the sections in their proper hi/lo orientation.
I tried the Right Stuff and don't care for it. It does not spread well and is too inflexible when it dries. A sample is at the top left of this pic.
I also tried regular Automotive Goop and found it unsatisfactory. It took too long to dry (if I remember right).
The spray on rubber coatings took forever to dry and required many, many coats. The less shiny areas in the pic are using the rubber aerosols. There are at least half a dozen coats on those samples.
So then I tried Shoe Goo and this stuff is great. It dries very quickly, self levels as it dries, can be re-coated a few times per day and works great with the fiberglass mesh used for drywall repairs. See the shiny areas in the pic. That's just one coat of Goo, compared to over half a dozen of the spray rubber.
Attached is the very damaged area behind the floor wiper/squirters on my 67. I'll show the front when I'm done with it.