Metal Surface Finishing: Methods You Should Consider

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Image of metal finishing processMetal finishing aims at treating the exterior of a particular product by applying a complementary layer on top of the surface. It is necessary because raw metal finishing is usually bare of style. For a complete look and feel of surface finishing, the following methods will bring about a better appearance:


If you want to achieve a nonlinear, random surface texture on your workpiece, then sanding is the way to go. There are various options that are applicable to a plate or a backing paper. Note that the lower the grit number, the larger and courser the particles will be and they will make a coarse surface and vice versa. Sanding is useful for curved and contoured surfaces, but it is a bad choice for extremely tight pockets or corners.

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Ultrasonic Finishing

If you are forming a tool for pressure die casting or plastic injection molding, it is ideal that you give its inner surface cavity a polish to create that finished look. In such cases, ultrasonic finishing is the best way to perform your metal finishing. It is typically an all-purpose finishing technique, but it produces better results when applied to smaller details and surfaces.


This precision technique helps achieve a high degree of flatness and surface refinement. It requires highly skilled craftsmanship to combine mildly abrasive slurry with a soft iron tool to perform random, slow, non-linear and very light motions on a workpiece by hand. Whereas lapping is possible through machine finishing, it has to be at a very low speed to prevent overheating.

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For you to select the best-suited metal finishing technique for your project, there are various factors that should be considered. They include the metal hardness, the production speed, and the cost-effectiveness of the method. Speak to your contractor to get details on each method.