Nik, it was just a guess based on some yellow Oracover I used to patch my Kankge Cap's wing-ding. It seemed to me to be about the same stuff. The adhesive backing looked similar too. Working temp. and heat-gunning wrinkles over open bays revealed very similar properties.
Although, the red Ultracoat I put on the firewall didn't exactly match the color of the fuse.
Maybe they are using several different brands of covering during assembly... Heck, I dunno. :spinnyeye

Let us know what you find out.

Jeff