I was recently warned that I should not apply a finer diamond spray/paste than 0.25 microns to a balsa strop, as its molecular structure is larger than .25 microns.

To me this sounded a bit weird. Balsa is not really an abrasive, I read stories of people using balsa strops with diamond sprays almost as if they were stones. And the grits progressions of the people shaving with a Master Wue cleaver definitely involved balsa strops with 0.125 diamond compounds.

What do you think of this?