In the day I was using this for high temp magnetic coils I was also riding to work. I thought this would make a great spoke hole tape. It did. Most of my time was on tubulars, but I started using this for the tandem were I ran 150PSI with no tape issues.
This is polyimide the same stuff Contenental started making tires from. Very tough stuff.
EBay has cheaper.
polyimide tape | eBay
Kapton Tape, Kapton in Stock - ULINE