A method in dry shake coating of a concrete floor is provided. On top of the concrete floor two or more superimposed dry shake material layers are applied. The surface of an underlying dry shake layer is troweled prior to application of a next dry shake layer, whereafter the lastly processed dry shake layer of a concrete floor is troweled. The application of an underlying dry shake layer is followed by spreading over its surface a water soluble silica-based medium prior to and/or during the course of troweling this particular dry shake layer and prior to the application of an overlying dry shake layer.