Oct 09, 2012 · Now you'll want to start the actual marble refinishing process of honing the marble with the sand discs and buffer machine. Begin the honing process with a lower grit sanding disc, such as a 220grit disc. After thoroughly refinishing the marble surface with a lowgrit disc, continue the process sequentially with finer grit sanding discs, such as a 400 grit, then 600 grit, and lastly, an 800 ...