Water Tank Surface Coating

Surface coatings protect the inside of municipal water tanks from deterioration and corrosion, as it forms a physical barrier between the water and the walls of the tank. Some protective epoxy coatings also give tanks an added layer of chemical resistance. The best type of coating to use depends on the design of the tank, the material from which it is made and the standards outlined.

Fiberglass and polyethylene tanks, particularly those stored above ground, may require surface coatings on the exterior walls to protect them from the impact of UV rays. Without the protective coating, the tank’s exterior will degrade. It’s not uncommon for water tanks made of other materials to have an exterior surface coating that protects against the elements and prevents heat absorption.

The best time to apply surface coatings to a water tank is before its installation to protect it from:

• Spalls
• Leaks
• Abrasives (e.g., silt, sand and other debris in water)
• Sunlight
• Freezing weather
• Cracks
• Tensile stresses
• Scale
• Organic and inorganic deposits (e.g., calcium, biofilm, manganese and iron)
• Chemical attacks (e.g., low pH levels or acid in the water)
• Chlorine losses in the stored water

If a contractor didn’t apply a water tank surface coating before a tank’s installation, it is possible to apply it during maintenance.

The Importance of Surface Preparation before Applying a Water Tank Surface Coating

​Protective coatings extend the life of water tanks and help protect the water they hold. The success of the coatings depends on the tank’s surface preparation. It is not enough to merely power-wash or use washouts to prepare the surface because they don’t fully remove organic and inorganic deposits. Leftover deposits reduce the coating’s durability and cause it to bubble, crater or crack.

When applying surface coatings, it’s also crucial to create the ideal environment for it to dry. Depending on the time of year and the tank’s location, the temperatures and relative humidity levels may prolong a protective coat’s drying time. Temporary climate control solutions lower humidity levels and promote optimal surface temperatures for the water tank surface coating to adhere to the substrate.

Polygon specializes in temporary climate control solutions that improve the performance of protective coatings during the preparation, application and curing stages. The solutions will help you stay on top of deadlines, reduce maintenance costs and prolong the amount of time between coating applications. Contact GRP Panel Water Tank UAE today to learn more about implementing its solutions with your water tank maintenance projects.