A professional-grade product, yet user-friendly that enables you to polish marble like the Pros! It will restore the majority of Water Stains and Acid Rings (chemical etches, that is) without the expensive services of a stone restoration professional. While not universal, MB-11 polishes most Marbles, Travertine, Alabaster (Marble-Onyx), Onyx and polished Limestone not by coating, but by abrasion and friction (like gemstone) as it was originally done in the factory!