It s a pain but if there s enough by way of thickness good meaning non scarred or cracked marble it can be worth it.
What grit for marble.
Switch the 120 grit sandpaper pad out for a 320 grit sandpaper pad.
After going over the entire surface with 120 grit sandpaper repeat with 300 grit sandpaper then 600 grit.
Grit sizes march through the double digits triple digits and beyond.
Step 7 dampen a clean sponge with water and rinse the sanding dust off the marble countertop repeating as many times as it takes to remove any.
This will require using a wet sanding process to achieve the desired results.
If the marble is thick enough it might be worth starting with an 80 or 50 grit with a belt sander belt glued to a flat board and going from there through the grits you ve already done.
Wipe the marble with a damp sponge to remove sanding dust.
Hardware and specialty stores.
While this method will work fine for statues tile and marble countertops sanding large areas of marble like marble floors requires a completely different process and technique.
Sanding marble is a time consuming process.
I guarantee you that you ll be using 120 grit 220 400 500 600 and over 1 000 grit.
Seal the marble if desired.