One of our fellow PCers asked me to try out his powder. Said it was from a commercial source that uses it on washers and dryers and the like.
Given what it is used on white is the only choice.
Ran though my normal routine and results are below. Powder is 'fluffy' and pic shows them ready to go into oven. They were tapped well on side of container before going on cooking mat
Shot of them post-cooked. the bare spots seem to be where I touched them with the hemostats along with some open areas that were 'just there' after cooking
Close up of cooked ones. I would not hesitate to use these as driving bands are well covered