What kind of stuff is it? A rubbing compound, with loose sanding abrasives, or something "fixed" like a sanding pad? If it is some fluid/loose material, I could understand this effect - under movement/pressure, the abrasives get hold on those surface parts that stick out the most. A coarse material will have a more "flattening" effect than fine stuff, which might even get lost in relatively wide sanding lanes and such - and a proper grit match to the sanding material is necessary. On a fixed pad, you do not have the problem - the particles are held in place, so they cannot "avoid" the high ridges, and the sanding effect takes place, nevertheless.
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DizzyFugu - Reporting from Germany

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I have my answer now.

It seems the finer grinded material is rougher/sharper on the particles whereas the rougher material with a higher grit it seems that the particles are not so rough and rounder and therefore don't cut into the material

After all this stuff is mainly used for grit blasting

..but this stuff still is marvelous! The one I tested is ~1500 grit... I know this is just a rough cause the standarts differ between US and Europa

it dulles the ball within seconds without a spinner... leaves a tacky surface and the dulling is even and without any striae I am normally seeing from pads
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Sebastian Koch
"Have fun and bowl well!" - Grayson
"Some things are made so even idiots won't fail using them.... But I ask what about the genius?" - Grayson

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Edited on 6/3/2008 5:14 AM