Abstract: A method for treating, such as repairing, protecting, sanitizing, and facilitating sanitation of inner surfaces of industrial buildings. This method comprises preparing an inner building surface that is to be treated so as to render the surface able to receive a calcium aluminate-based cement-based mortar with which the deficiencies of the surface are corrected. The surface is then coated with two materials: a primary coating, which provides a regular surface and enhances the adhesion characteristics of the resurfacing system and a final coating such as poly-urea.