FAST GRUNT U is a ready-to-use preparation for priming and leveling absorbency on various surfaces. It is ideal for use on concrete, aerated concrete, cement and cement-lime plasters, gypsum plasters and gypsum plasterboards. It can be used both inside and outside the building. It is an excellent base for substrates for paints, wallpapers, putty, adhesive mortars and leveling as well as cement floors. Increases material adhesion in finishing to the ground and reduces dustiness. An excellent advantage of the preparation is prevention of mold and microorganism development on primed substrates.