SGM MSW222 50 lb Gray/White Marble Set Medium Bed Latex Mortar . Marble Set latex-Portland cement mortar is a medium bed bonding mortar formulated for the installation of thin marble, granite and large format tiles. It may be used for either floors or walls in both interior or exterior applications where the mortar will help compensate for irregular substrate or tile thicknesses. Marble Set may be used in setting bed thickness from 3/32”( 2.4mm) up to ¾” (19.1mm) after beat in. Redispersible powder additives and plasticizers are used to improve adhesion, provide greater bond strength and resistance to impact and shock. These additives allow for some latitude in time, working conditions and temperature.