... b. Flexibility, buffer for small cracks on the wall;c. Excellent alkali resistance, water resistance and impermeability ... hardness. It is used to cover the full wall or partial leveling, such as cement mortar, concrete ... .7. Polish the putty smoothly, remove the floating ash and brush primer or finish after the ... seams powder. The old wall should be cleared of paint, oil, shell and floating dust.2. The ...