+1
You don't want the abrasive coming off of the sandpaper to mix with your slurry. Even the finest wet/dry sandpaper will have much larger particles than a coticule.
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For sure what Jimmy said.
I bought a cheap knock off diamond stone for this purpose. DON'T make the same mistake i did, go for the DMT. I did not notice till I started slurry with Japanese natural and felt crunchy:confused: sensation which I have to conclude it is polycrystataline cheap diamond comming off.
Mike