I have heat shrink tubing and know how it works. Similar tubing that I have does nothing, not with the heat being applied, not even the least in boiling water and not with ice from compressed air.
It has the same size, looks the same and also comes in pieces or on a spindle.
Is there something that I am not being aware off, does some loose its ability to shrink completely over time or would this be another product (then what is it). Many thanks.