Wall putty is a waterproof white cement-based putty ideal for use on concrete/mortar walls (interior and exterior) and ceilings. It fills the fine pores of mortar/concrete walls and ceilings and proves to be the white, smooth and dry surface necessary for painting. Thickening: Our HPMC products thicken putty powders to enhance their suspending ability, resistance to sagging, and to maintain a homogeneous solution. Water Retention: Our product keeps the putty powder in a moist state, allowing the auxiliary calcium ash to react in the presence of water. The more about HPMC for Wall Putty you can click here.