As the vast majority of all larger tanks for storage of liquids are made of steel, they all need to be coated on the exterior surfaces to protect the steel from corrosion as well as for aesthetic reasons. The interior surfaces will in most cases also need coatings to protect the steel against corrosion, but here it is equally important to protect the liquid cargo against contamination. Water storage is very important in a world where potable water has become a scarce resource. Larger tanks made from steel or concrete will need to be protected on all interior surfaces with special certified coatings in order to ensure the potable water quality. High water quality without impurities and smell means that solvent free coatings will only be able to pass the prequalification testing requirements in the future.
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