Do’s: The only problem is “smoothness” of the wall and joint marks between the shutters. Holes in a line across the vertical walls. Or a thin layer of oil coating on the surface. Therefore it is advised to sand the surface with an instrument like a disc sander. This will solve the problems of oil layer and will mask the surface roughness. Before doing this all holes must be sealed with Home Shield Latex Plus Or Advanced Latex Plus and cement in the ratio of Latex Plus: Cement: 1:3 & Advanced Latex Plus: Water: Cement: 1:3:10. Both cases sand as required.