Sandblasting or abrasive blasting is a common method that is used to remove old paint, rust, mill scale and other debris in order to prepare a surface for inspection or coating. Most exterior coatings require the surface to be prepared as specified by Commercial Blast SSPC-SP6 (SSI-Sa2), or NACE #3. This specification states that when viewed without magnification, all of the rust, dirt, mill scale, prior coatings and foreign matter must be removed prior to recoating the surface.  ...
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