A growing number of water tanks across the country are going “green” with the increased use of low volatile organic compound (VOC) hybrid aliphatic polyurethane finish coats that are compliant with air quality regulations throughout the United States and Canada. Developed as a replacement for existing acrylic polyurethane technology, the new Series 740 Endura-Shield UVX and Series 750 Endura-Shield UVX offer a unique combination of high-quality polyurethane resins, resulting in industry-leading performance and exceptionally low VOC levels.

The advanced technology polyurethane finishes offer superior color and gloss retention for long-term aesthetics on a wide range of steel exterior structures. The durable film stands up to abrasion and exterior weathering.

In numerous water tank applications, the coatings have demonstrated very good brush, roll and spray application characteristics.

At Lake Farm agricultural theme park near Kirtland, Ohio, Series 740 replaced a specified standard polyurethane finish on a 700,000 gallon standpipe when the owner wanted better color and gloss retention. The finish coat was roller-applied at 3.0 to 4.0 mils dry film thickness (DFT) over a zinc primer and epoxy intermediate coat. “With only 92 grams per liter VOC, this coating is a significant leap forward in terms of volatile organic compound levels,” according to Sean Carlin of Coating Innovations, LLC. “VOC levels didn’t need to be that low for this project, but there were other benefits such as color and gloss retention that favored this product.”

The exceptional color and gloss of the Series 740 was evident when the Hopkins Water Supply Corporation in Sulphur Springs, Texas, used it to overcoat a 65,000 gallon ground storage tank that sits alongside a second ground storage tank that still had its original finish. “It has a unique gloss and color that stands out quite a bit compared to the other tank,” coating consultant Justin Taute observed. “We feel it’s a better product than the standard polyurethanes.” Series 740 was spray-applied to the tank’s exterior at 3.0 to 5.0 mils DFT over a modified polyamidoamine epoxy primer and high solids water-based epoxy tie coat.

In the City of Huntsville, Texas, coating contractors for a 2-million-gallon hydropillar were able to save on labor costs by replacing a traditional urethane finish coat with Series 740, which was roller-applied at 3.0 to 5.0 mils DFT. “The products that had been specified for the tank would have required the contractor to make two applications,” acknowledged Patrick Barry of The Barry Group, LLC. “By replacing those coatings with the new polyurethane technology, they were able to put the Series 740 Endura-Shield on in one coat without having to double-coat it. The contractor gained the labor-savings alternative he was after.”

Weather was a factor when the hybrid polyurethane finish coat was applied to a 500,000-gallon elevated water tank serving the City of Perry, Georgia. “It was a three-day application and the weather conditions changed drastically from the first day to the third,” recalled Dean Drehoff of Southeastern Resources, Inc. “The first day started out very sunny and dry, but by the third day the temperature had dropped 20 degrees and the humidity had climbed to 85 percent. From the applicator’s standpoint, the coating performed very well under all the environmental conditions they were faced with on that job.” 

Cool temperatures and high winds were a concern for engineers with the Sweetwater Treatment Plant in Texas, where Series 740 was used on a steel storage tank. “We were interested to see how the new Series 740 Endura-Shield polyurethane coating would handle cold weather,” noted Lane Salvato of The Barry Group. “The coating seemed to handle the temperatures well. The project’s contractor commented that the coating cured fast and they liked its high-build properties. The film covered well and hardened quickly.”

Salvato added that the city’s consulting engineer has specified Series 740 Endura-Shield on several additional projects, which is the best indication of a customer’s satisfaction with a product. 

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