I have applied the balancing mass on an old, dry screed, with good ventilation and temperatures of about 18 ° C. The surface was previously painted with MEM primer. The floor leveling compound was mixed as a whole sack of precisely specified amount of water and a whisk. The layer thickness was very thin, 2-4 mm, and after two hours everything looked unchanged. The floor leveling compound was walked on the next day, so after 18 hours. This has caused me great difficulty, because I assumed to be able to go to two or at least three or four hours back through my hallway. The specification of two hours is just plain wrong.