Once all the chamfer work has been properly executed and the flood test has been successfully executed, the inner and outer surface of the overhead tank should be ready to plaster.
It is recommended to use Silmix and Ressi SBR 5850 as mortar admixtures to make sure that there are no cracks in the plaster and the plaster itself is water repellent.
It is recommended to add 1 Liter of Silmix along with 1 Ltr of Ressi SBR 5850 with every bag of cement used for the plastering of internal and external areas of the overhead tank. It is to be ensured that the internal plaster of the overhead tank should be finished slightly rough, exposing some grains using a foam (Foam finish plaster). This will provide a good key for the subsequent coating of Water Guard 491.