to the freshly placed concrete after finishing apply evenly CCA 99 by painting brush or by spatula. About 1mm. thick layer is suffcient for getting desired results. While applying with brush make it brushable with 10% clean water. While application the surface must be free from oil, greases etc. For horizontal surface on-exposed slabs it should be applied as soon as the initial sheen disappear from the surface or the surface is free from excess visible water. On vertical & formed surface apply it after dampening down the concrete with clean water. The film dries with in 2 hours, but shall not subjected to rain water or otherwise before 12 hours of application.