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Tell us the tank material, size and how the water is used. We will connect you with a certified applicator who can inspect and quote.
Water is the most common thing stored in a tank and one of the hardest on it. Steel water tanks corrode at the water line and in the condensation-soaked roof; concrete water tanks leak through shrinkage cracks and joints and slowly lose their surface. The right coating stops both, but anything that touches drinking water has to be certified for it. This guide covers steel and concrete water tanks, potable and non-potable, and when spray polyurea is the right choice.
For drinking water, use only a coating certified to NSF/ANSI/CAN 61, applied at the certified thickness and fully cured, then disinfect the tank before service. Steel tanks are usually blasted to near-white metal and lined with an NSF 61 epoxy or polyurea system. Concrete water tanks need a flexible coating that bridges cracks; spray polyurea gives a seamless, thick membrane that a brushed cementitious or acrylic sealer cannot match. Non-potable tanks for livestock, fire water or irrigation have more product options.
Corrode at the water line, the floor and the roof underside. Coated per AWWA D102 inside and out.
Leak at cracks, cold joints and penetrations; surface erodes over time.
Concrete, steel or galvanized tanks on farms, ranches and homes. See cistern liners.
Concrete water tanks move. They expand and contract with temperature and fill level, and they shrink as they age, so they crack. A rigid coating cracks right along with the concrete. A thick, high-elongation polyurea membrane spans those cracks and seals cold joints, penetrations and the floor-to-wall corner in one seamless layer.
Remove sediment and biofilm, pressure wash and let the concrete dry. Test moisture before coating.
Abrasive blast or grind to remove laitance and open the surface.
Route and fill cracks, patch spalls and bugholes, and detail joints and penetrations.
Apply the primer specified for concrete; it seals outgassing and improves bond.
Apply polyurea in multiple passes to the specified thickness, including walls, floor and coves.
Holiday test, verify thickness, allow the certified cure, then disinfect per AWWA C652 before potable use.
Steel water tank interiors are typically blasted to near-white metal and coated with an NSF 61 system per AWWA D102. Exteriors get a weather-resistant system with a UV-stable topcoat. Pay special attention to the roof underside and rafters, which stay wet with condensation and corrode first.
Livestock tanks, fire water tanks, irrigation storage and rainwater cisterns not used for drinking have more freedom. Spray polyurea is popular here because it seals leaks, survives freeze-thaw and hoof or equipment abuse, and returns to service quickly. See our stock tank liner page for small tanks.
A certified ArmorThane applicator can inspect your steel or concrete water tank and quote the right system, including certified options for drinking water.
Contractors: become an ArmorThane applicator
A thick, flexible coating that bridges cracks, such as spray polyurea over properly prepared and primed concrete. For drinking water, the product must be certified to NSF/ANSI/CAN 61.
Only polyurea products certified to NSF/ANSI/CAN 61, applied at the certified thickness and cured as required. Ask for the certification listing before work starts.
Drain and clean the tank, prepare the concrete mechanically, repair cracks and joints, prime, then apply a seamless membrane such as polyurea. Surface sealers alone rarely stop leaks through moving cracks.
Well-applied interior systems commonly last 15 to 20 years or more. Regular inspections, often every few years, catch coating damage early.
For potable water, yes. Tanks are normally disinfected per AWWA C652 after the coating has fully cured and before returning to service.
Owners get a certified ArmorThane applicator for steel and concrete water tanks, cisterns and stock tanks. Contractors can add tank coating with our equipment and training, with no franchise fee and no royalties.
ArmorThane has built a strong reputation over the past 30 years for producing high-quality, durable protective coatings.
Tel: 417.831.5090
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We want to help you find the best ArmorThane applicator for your protective coating project. Please either fill out the request form below or call us toll free at 417-831-5090, any time Monday-Friday, 8:00 a.m. to 5:00 p.m. Central Standard Time.
Connect with an authorized ArmorThane professional to get a long-lasting, seamless protective coating for your RV. Submit the form below or call us directly at 417-831-5090 (Monday–Friday, 8:00 AM – 5:00 PM CST).
