Finish with a wax coating if more protection is desired. Two or three lighter coats are better than a single heavy coat, allowing the piece to dry between coats. Once the desired patina has been achieved, seal the piece with a clear sealer, metal oil or wax. Use two different finishes, one on top of the other, to achieve different effects. As the chemicals react with the metal surface, a colored pattern appears. Then, depending on the formulation, allow the finish to sit for a few minutes up to a day. Following directions for the particular finish, immerse the object in the stain or dye, or spray, brush, sponge, roll, or rub it on. Different finishes may require the surface of the metal to be either hot or cold (room temperature). Make sure the piece is completely dry before proceeding. Or, use a wire wheel or vinegar to etch the surface lightly. For some processes, the surface can be cleaned and abraded with an electric sander or sand blaster to better allow dyes or coatings to adhere. Be sure not to touch the piece with your hands, which would leave behind unwanted oils. The metal must be clean and free of any grease, dirt, rust or scale using a metal cleaner and degreaser. Work outside if possible, or in a location with adequate ventilation. Be sure to wear appropriate personal protective equipment, such as gloves, goggles or safety glasses, and a respirator if needed. Watch this video about selecting the right patina based on ideal look, metal alloy, and layering options.įollow these basic instructions for creating a patina. Not all patinas, waxes and oils can be applied to all metals, so be sure read the instruction. Thanks to modern metallurgical science, a patina can make any metal finish "come to life with rich surfaces and vivid colors." Different metals, such as galvanized aluminum, tin, stainless, iron, bronze, and copper, produce different patterns and colors using different types of finish. A patina isn't just copper gutters turning green with age – it is the coloring of any metal surface by natural weathering or chemical "rusting" with acids. They meslt and fuse into a continuos coating, giving less internal heat reflectance and a "tighter" adhesion to the surface.Whether you are creating an artistic sculpture or an architectural design, sheet metal finishes are easy to achieve. The pigments in them ar polymer based, not mineral generally. There are some powder coatings.and some flame sprayed coatings, that are probably good to coat engines with. That would absorb heat towards the inside. This is because these three types of coating have an intimate electrochemical, molecular bond at the surface metal.that does not block normal ductility of heat transfer.Īlso, it should be masked.to make sure that the inside surface is not blackened. If I were to do anything to a case or metal surface to color it and absorb or deflect heat.I would either anodize it black.or darken it by staining it like you are thinking, or parkerize it. The flatter the black surface.the more it is capable of absorbing. Gloss pending on the degree of gloss and the angle of incidence of the light/heat waves.can reflect away upwards to 30% of the heat.or more. That spectrum includes infrared.which is heat. It does this because.the color black.unless its glossy, does not have the natural ability to reflect most of the light spectrum. Black attracts heat from any heat source and from any direction (inside and outside), as long as radient heat in the form of infrared radiation can traverse that gap. that a black case will draw heat in from external sources, like the exhaust. While its true that the darker the surface.the more heat it attracts, it does not mean that it will radiate that heat well. They are generally not designed to abosrb heat.just get rid of transmitted heat from surfaces they are on. Heat shedding paints are different animals. You must be careful what you use.and test it for how fast it radiates heat compared to bare metal. Not all paints are bad and do this.but most do. Painting the case with normal enamels.no matter the color, forms a heat barrier due to the pigments and minerals contained in it.
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