UTH and foil tape

[Bogertophis]

Heat tape does NOT have a sticky side.
A heat mat does and is encased in a rubber insulating coating.

Yes, I know...http://www.reptilebasics.com/heat-tape
What they are saying is that if you use heat tape on metal or with metal tape, that thin cover of plastic that it's encased in is NOT enough for safety.
As I said, foil tape (if used to secure 'heat tape') should not be over any of the inner electrical connections. It can short...

Sorry, I missed that from OP what kind of UTH was meant. And I bet there's ppl using foil tape to secure "heat-tapes".