Hybrid aliphatic polyurethane water-based varnish used for the protection of microcement coatings on walls or light traffic floors. It is also applied in one layer (1/1 in water) prior to the application of two layers of PLANOFINISH PU 2KS, PLANOFINISH PU 2KS MAT or PLANOFINISH PU 2KW MAT aliphatic polyurethane varnishes in order to enhance protection against colour alteration of the coating in areas with heavy use.