White, special primer with extended open times for opaque priming indoors and outdoors before subsequent dispersion, dispersion silicate, and silicone resin paints. Adhesion-promoting pre-coating on smooth, load-bearing substrates, eg on plasterboard (GK), concrete, as well as on weakly absorbent mineral plasters PIc - PIII, gypsum plasterboard and finished plasters PIV and gypsum plasterboard. As a handy base coating against wallpapering of all kinds on smooth, slightly absorbent surfaces.