Kapton
Well, for what it's worth I think Kapton wiring installations** that have been properly designed, correctly installed AND maintained are ok. However when added "ad hoc" to airframes as "short term modifications" that then are still flying some 20+ years (in some cases) later it does call into question the integrity of the engineering processes that STILL call for these mods to be left in the airframes.
Re the YG system & Kapton wiring - is this why the CB issue is so important re Pod overheating or Fan failures?..
..Basically after the topcoat becomes damaged the kapton degrades as an insulator until it "flashes over" and basically becomes a conductor liberating a lot of energy as heat (<3000C). It also can support the current demands of the consumer units thus not providing the crew with any type of system failure as a warning whilst it can have the very sneaky practice of not tripping cb's due to the short duration of the flashovers. It can also spread ALONG a harness.
**No I wouldn't call the battery/avionics compartment of your average Tornado such a suitable installation/zone.
Mojo