ALL 20S
+1y
it actaully depends on what type of sand. There is a type of sand for heavy duty blastin and a finer sand. I sand blast semi-frames at work and the only pittin it does is when there are huge scabs, which isn't from the sand. I just blasted a boat trailer, there was no rust, guy wanted a color change, no pittin at all. The media blast is also a very good way to go. Depends which way you perfer.