Sandblasting is the most effective method of preparing steel surfaces before painting or applying a protective layer against corrosion.
The metal surface must have such characteristics that it ensures a good bonding of the protective coatings.

For this reason, it is necessary to clean it up from anything that is extraneous to the metal itself in a chemical sense.

In fact on the surface of the steel products used in the building industry, there may reside various oxides and salts, rust and calamine, as well as traces of old paint and other foreign substances that compromise the effectiveness of the protective system as they create intermediate layers between the real metal and the actual anti-rust protective film. This causes reduced stability and adherence.