I can post pics tonight, but here's what I did:
I cut pipe insulation in half lengthwise, then cut it to length to have it wrap around the GF w/o an overlap. At the butt ends I taped it onto itself with electric tape (I did not tape it to the GF). I placed 3 of these wraps on the GF at the top, bottom and middle. They surprisingly held nicely in place, almost like Velcro! I then created a wrap of Reflectix with about 8" overlap, cut out to closely fit around the STC and slits for the attachments of the discharge pipe to the GF. I cut a small X for where the probe resides (just push probe thru) and a small U for the cord. I attached the Reflectix onto itself with command strips of Velcro. I then made another wrap, but this time I staggered by about 10-12" where the 2nd layer would end so that it wasn't in line with the first wrap. Again I held together with the command strips. It was rather simple, just have to measure well. I also used the larger roll (24") instead of the 16" roll as I wanted it go from the bottom by the black base to the very top- not sure it was needed but I like it and it works. What I also liked was the pipe insulation closes the space at the top and the bottom, not to mention the Reflectix is rated up to 180 F and I figured at full boil the single wall GF would be hotter than that. So there you go, a safety feature even! I keep thinking I like that I can take it off without issue, but haven't done that yet, so I may decide to tape the joints with the silver foil back tape used on flue pipes.