What is Sandblasting?
Sandblasting is one of most effective ways to shape or strip and smooth a surface of any foreign material. It has an effect similar to that of using sandpaper, but provides a more even finish with no problems with corners, nooks, or crannies. Sandblasting helps to rejuvenate the material and start the process of making it look new again.
Sandblasting uses compressed air to "blast" fine sand or other very abrasive, high grit materials through a nozzle and at the object desired to be sandblasted. These abrasive materials quickly remove the surface of the object leaving a clean surface.
Another advantage of using a sandblaster to prep your items for powder coating is it gives the item a surface profile or "tooth". Think of sanding a piece of metal with sandpaper and you see the thousands of little scratches that it leaves. These scratches create high points and low points in the metal. This is called a profile. A profile allows the powder coat to seep into all of these high and low points which allow it adhere to the part much better than if the metal was completely smooth. While sandpaper does give your item profile, the sanding marks are in straight lines, a sandblaster creates a uniform textured finish all over the entire surface of your part, and in places that no sandpaper can reach. Without a surface profile, powder coating can just peel off the surface, this is called delamination.
Why Sandblasting Works?
Sandblasting is a great preparation method for Powder Coat. When powder coating, it is very important for the item you are coating to be completely clean of oils, dirt, paint, rust and corrosion. All of these things can interfere with the powder coating process causing imperfections in the finish or causing it to fail completely. After cleaning your item of all oils and dirt, a Media Blaster does this job very well and very easy compared to other methods.