Precautions while plastering - 1. Before plastering, pour sufficient water on the building a day in  advance. 2. Make the surface rough by chipping/scrubbing. 3. Use the sand-cement mixture within an hour after mixing. 4. Plastering for the first layer: cement:sand = 1:4. II layer: 1:6 is recommended. 5. Use Birla Shakti for plastering - its heat of hydration is less. 6. Curing needs clean water. Do it for atleast a week.

Concrete Quality is spoiled due to - 1. Improper water : cement ratio. 2. Use of concrete which is already set. 3. Use of aggregate rendered impure by silt/organic matter. 4. Inferior quantity of reinforcement material. 5. Lack of compaction 6. Delay in transportation of the concrete at the destination