Re: sandblasting before polishing?????????
Usually 220 to 320 if the part is in decent shape. General rule of thumb is to increase grit no more than 100 grit per step. I usually go to black after 600 wet while others prefer to go to 1500 or 2000 grit. Most is going to be whatever works best for you. It's important to get the scratches all the way out from the previous step before moving to the next step.
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