I start with the 50 grit, then slurry with pure portland cement mixed with colored dye and a small amount of water to get it to the consistency of peanut butter. I pre-wet the surface with water and keep it damp to spread the slurry with a 5 or 6 inch putty knife.
After 2 days, I grind with 100 grit and slurry again if necessary. Then I grind with 200 grit and slurry again if necessary. If no more slurry is necessary, then I go ahead and polish to 1500 grit if a glossy surface is desired. If a matte finish is preferred, I stop at 400 or 800 grit.
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