MB-21 is a Professional grade premium solvent based, VOC compliant formulation, MB-21 is an easy to use, clear, very low odor, non-flammable formulation that was designed for homeowners and contractors alike. MB-21 is safe to use on food prep surfaces and not sensitive to most common household acidic substances. The result is permanent, MB-21 provides optimum sealing capabilities protecting against oil and water based staining agents. It will enhance the color (darken) of tumbled marble, unpolished limestone and any other non-polished (honed, cleft, flamed, etc.) stone surface including brick, concrete, and terracotta. Coverage area: 100-200 sq feet depending on the stone.