Crystalseal ADMIX NF is a dry powder admixture designed to provide effective waterproofing for concrete and cement mortars in a no-fines grade. It consists of O.P.C. and active chemicals that react with moisture and the by-products of cement hydration to generate insoluble crystals throughout the pores and capillary tracts. This permanently seals the concrete against water and waterborne contaminants from any direction.