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I'm not a fan of tape dispensers unless you use the tape very frequently. They leave quite a length of tape adhesive exposed to the air. For the polyimide or "Kapton" tapes, I just fold over a little...

Kapton tape is like Crescent wrench, or Kleenex tissue. It's a brand name, not the actual object name. Polyimide tape is what you ought to be searching for, and it really isn't expensive. Also works...