I would try honing if mb-12 and strippers would not work, I would do a 200g dry diamond then a 400 and mb-12 should be perfect.As far as the sandpaper goes be cautious it is very easy to cause dimples and dips with sandpaper, in a shower you most likely would not see it but when it comes to floors be cautious, diamonds are always a better choice for honing than sandpaper.
Good luck..........and pics would help ALOT!!!!

--- On Mon, 7/27/09, PBunis@aol.com <PBunis@aol.com> wrote:

From: PBunis@aol.com <PBunis@aol.com>
Subject: RE: [sccpartners] Botticino Walls
To: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Date: Monday, July 27, 2009, 5:53 PM

Its possible but, it hasnt responded to stripper,razor,polish or anything else....yet.
Paul Bunis
Xtremeclean Tile & Specialty Stone Care