The surface shall be cleaned thoroughly of all contaminants like dust, rust, traces of curing compound, oil & grease. All surface imperfections and protrusions are to be removed & repaired. Structurally unsound and friable concrete must be removed and repaired with a suitable concrete repair mortar.
It may be applied to damp but not waterlogged surfaces. Old concrete and steel must be structurally sound prior to application. Light mechanical grinding/grit blasting/high-pressure water jet may be used to clean the surface of all the contaminants depending on the degree of contamination on the surface to be coated