I just finished cleaning, mopping (with hBN suspended in alcohol), and fire lapping 15 pellets (that were coated with hBN suspended in alcohol). It's hard to describe how slippery this stuff is!
One thing to note is that when coating the pellets (in hBN suspended in alcohol) that after they dried there was quite a bit of build up inside the skirts. I may use these to "reapply" a little hBN after cleaning, but I don't think I'll shoot them that way. Perhaps a dry powder application would be better if someone wanted to actually shoot hBN coated pellets (unless you have a tumbler with fine medium to help ensure the material doesn't build up in the waist/skirts).
*As
@jkingrph stated above - even though the powder is non-toxic I wouldn't suggest inhaling any of the nano particles