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Polymer-modified cementitious coatings are one popular choice for concrete potable water tanks. Epoxy coatings work well for both steel and concrete, as do polyureas and polyurethanes. Metal structures require additional protection. The exteriors are usually painted with a direct-to-metal acrylic coating, which are economical, durable, UV-resistant and offer long-term flexibility. Two-part epoxy-based coatings are also popular, since they adhere well to a wide range of old coatings with minimal surface preparation. Metal tanks also require cathodic protection, which is beyond the scope of this article.