I tried it a few times and it seemed to work.
I have some and will use it again.
I made these adjustments to the described process:
1. I sanded the ball fairly roughly, about 280 - 320 grit.
2. I used about 1/2 the amount of material.
3. Once the ball and the powder were in the bag and I had sealed it, I really pressed the material into the surface as much as I could, thoroughly coating it.
4. I left it in there for 24 - 48 hours, moving the ball and the powder around a couple of times over the period to insure new material always stayed in countact with the ball's surface.
I alos used a dust mask, just in case, when I cleaned the material off the ball. Then I used a good ball cleaner to insure all the powder was off the ball. Then I brough it back to whatever surface was needed.
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"None are so blind as those who will not see."