How To Apply a Water Tank Lining (With Video)

What Is a Water Tank?

A water tank collects or stores water for later use. They are used in various industries such as sewage and wastewater, agriculture, chemical, nuclear, etc. The purpose of the tanks differs from industry to industry. Still, they are generally used in irrigation, cooling materials and equipment, and water treatment.

Within time the water tanks and secondary systems can corrode due to the water, high moisture environment, and corrosive solutions such as chemicals. In addition, deteriorated equipment and structures may lead to leaching, leaks, and environmental damage. However, applying a water tank lining can prevent the listed issues and more.

Water Storage Tank


A water tank lining is a coating that will create a barrier between the tank’s substrate and the stored water or aqueous solutions. The barrier is chemical-resistant and corrosion-resistant; therefore, it prevents the common issues presented by corrosion. There are water tank lining coatings that are certified safe for contact with potable water. These coatings do not contaminate the water, making them safe for human consumption. Furthermore, the coatings are solvent-free and require no hot work or welding, adding to their safety.

How To Apply Water Tank Linings

To apply the epoxy tank lining, Belzona 5812 DW:

  1. Brush away loose contamination and clean with a rag soaked in Belzona 9111 (Cleaner/ Degreaser).
  2. Abrade the surface to give the necessary minimum depth profile of 3 mils (75 microns).
  3. Transfer the entire contents of the Solidifier container into the Base container to mix large quantities of the material.
    1. Mix 2.6 parts Base to 1 part Solidifier by volume or 4 parts Base to 1 part Solidifier by weight for small quantities.
  4. Mix thoroughly together to achieve a streak-free uniform material.
  5. Belzona 5812 DW can be applied using a stiff-bristled brush or a rubber squeegee to the recommended coverage rate.
    1. A second coat can be applied, if needed, after the minimum overcoat time of 4 hours at 72F (22C).
  6. Allow the application to dry. The mixture will solidify under cold conditions down to a temperature of 41F (5C). However, solidification time is dependent on ambient temperatures. The lower the temperature, the longer the solidification time. 

Additionally, some epoxy coatings for water tanks, such as Belzona 5812 DW, can be applied using sprays. It can be applied in suitable areas using a heated airless spray. The typical setup would be a 63:1 airless spray unit with either an in-line heater or trace heated lines capable of raising the product temperature to 122F (50C). A solvent must not be added.

Before and after applying a water tank lining
Before and after applying a water tank lining
Belzona 5812DW water tank lining application
Belzona 5812DW water tank lining application
Belzona 5812DW colors
water tank lining brush application
Water tank lining brush application

The product can be spray- or brush-applied onto metallic surfaces, concrete, brick, and others, offering effective protection of equipment operating under immersion conditions from corrosion damage. The water tank lining repairs clarifiers, tanks, internal and external pipework, valves, fittings, water boxes, utility holes, and cooling tower pans in contact with potable water. 

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