ATM Abrasives uniformity

[lifedata@vol.com]

How far off the average grit size would you use an abrasive?

I have some aluminum oxide rated at 46 microns.  I'm not too worried
about small granules down to about 30, but medium power microscopic
examination indicates there are some granules in there in excess of
90 microns, and I might have missed the worst.

Isn't this going too far out of range.  Won't this put scattered
monster pits on my mirror.

Jim L
1 John 5:13