Whistle while you work is also missing a very important part of the description.

When it says the progress goes up when it wears off the full meaning is this:

You will involuntarily use a step when it wears called "finishing touches". This has a chance to fail (but idk the %), it feels around the same as a CSII (could be other factors) and does use 10 durability.

So be careful about the durability left when that's gonna wear off.