Oh, I believe you, Ahcuah. I know you're an ardent barefooter/barefoot hiker, so I can image you have a lot of experience with this. It's just that Vaseline is something lots of people have in their cabinets, so that's why I recommended it.I apologize. I overspoke. I don't doubt that Vasoline can help.
However, I won't retreat from saying that there is no need for such a gloppy attempt at a solution. And, at that, a "solution" that is not as effective as something containing urea (and doesn't address the root cause).
Seriously. Try the Flexitol Heel Balm and you'll see it works even better, and without all the glop.