Determine moisture content of the slab/screed. The relative humidity (RH) must not exceed 98%. The surface must be free from glue, paint, oil, building residues etc., as well as other impurities or finishes that can impair the absorption of the product. Where necessary the concrete should be brushed, ground, milled or blasted. All loose material and residue water must be removed. Make a test application of Creom on a small area to avoid incorrect use. Check that it is absorbed by the concrete and does not form small ubbles.