The factory-made "pre-weathered" RHEINZINK material ensures the immediate appearance of a slate blue surface. The new surface treatment protects the material against traces of transport, storage or processing (fingerprints) to the greatest possible extent. Roll-forming profiling machines process it oil-free. It is recommended to use RHEINZINK "pre-weathered-pro slate blue" particularly on optically demanding roof and façade areas, coverage, and roof drainage systems. If possible, façades should always be treated with RHEINZINK-"pre-weathered-pro slate blue".