Profile: Technical Metal Finishing Co. Inc. specializes in providing metal finishing services. Sulfuric anodizing provides corrosion resistance and can be dyed to produce a variety of colors. Hard coat anodizing is designed for parts with high wear functions. Type III anodizing creates a coating with hardness characteristics harder than sapphire. Non-destructive testing (NDT) is a process that is used to evaluate the properties of a material, component or system without causing damage.