For any metal surface, Dye-Oxide Patinas come in many colors. They do not contain acids so they do not react with the metal. The color of these transparent patinas will remain the same. They will not change as with an acid patina. They are UV safe indoor or outdoor, and have no VOC's. They can be applied hot or cold to any metal including iron, steel, and aluminum and do not cause rust. For hot application the metal surface needs to be clean and abraded before application, heat the metal to about 200°F. Apply by spray, brush or rag. Reapply if the color is not intense enough. Finish with a clear sealer when finished. For cold application follow the same preparation and apply by spray brush, brush or rag. when using cold it is essential to fix teh colour on the surface with a clear sealer.