Improves the strength and load-bearing capacity of substrates and increases the adhesion of tiles, plaster and wallpaper. Protects thin-bed mortar or leveling filler from too rapid water removal on absorbent substrates, especially Prevents bubble formation and rapid water removal when leveling the subsurface, e.g. B. with PCI Periplan or PCI Periplan Fein. as well as stable floor leveling compounds and other hydraulically hardening mortars and anhydrite screeds. For priming aerated concrete and brick masonry on walls before applying gypsum and lime-gypsum plasters. For solidifying floury, absorbent screed surfaces and plasters inside buildings before laying tiles and mosaics. For moisture-retarding solidification and priming of gypsum plasters, gypsum floorboards, gypsum plaste.