Following extensive lab testing on shot peen vs. polish, SPANK has announced that all SPANK 2017 product will be offered in shot peen finish only.
The shot peen finish is not only superior in terms of UV resistance and scratch resistance, but it also adds a more high end satin finish to the lines. The aesthetic enhancements are however a surface benefit to the real value in moving to shot peen. Where mechanical polishing removes material in an abrasive process, the shot peen process by contrast tempers and strengthens the material.
Shot peen, is a non-abrasive process, where the material is compressed in the surface layer. It‘s like dozens of small hammers pressing the surface of the material to „cold work“ it. It does not remove material; but rather reworks it - like forging. There is no removal of material and the process strengthens the material surface.
WARNING! DON’T MISTAKE SAND BLAST FOR SHOT PEEN!
Sand Blast or Shot Blast by contrast, is an abrasive process developed to clean the surface of material before further treatment (such as painting). It removes material and generates a rough surface good for adhesion of paint (typically). Because material is removed, it also generates a lot of harmful dust. The sand blast process compromises the integrity of the surface material by essential blasting ‘fractures’ into it. A sand blasted finished product will have a rougher and perceptibly ‘cheaper’ look and feel to it. Shot peen on the other hand has a noticeable velvet or satin look and feel.