The adhesive is spread on a 4 to 5 mm layer, after which the comb is pulled with serrated trowel 6-10 mm, depending on the size of the boards. The open time for soldering is at least 30 minutes. Only the amount of material that can be coated during open time for bonding is supported. When applied on a smooth, non-absorbent surface such as scratched cement, mosaic, sandstone or old tile, apply a layer of adhesive as a bonding glue to a thickness of 0.5 - 1 mm.