Doesn't matter if you did a good job documenting and proving that you didn't use work equipment. I remember a speaker once telling an audience something like don't even use the same brand pens or notebooks purchased by your employer to jot down your ideas and stuff.

Well, of course, as long as those are the rules and the scenario. The grandparent offered a bit different scenario.

The moral is quite clear, though: don't ever, ever use someone else's equipment and time to build your own thing.

And now I realize how heavy that scenario is too. Dang. That's heavy.