Australia Desalination Polyurea Project Case

1. External Concrete-Side Protection

BW8009 Concrete Primer + BW3-900 Spray Polyurea

For desalination infrastructure, the external concrete-side areas are not only exposed to ordinary weathering. They may also face moisture, salt-containing air, surface contamination during transport and installation, and long-term durability pressure from a marine or water-treatment environment. Concrete is a porous mineral substrate, so the coating route must first deal with surface absorption, pinholes, small defects and bonding stability before the main protective layer is applied.

BW8009 was used as the concrete-side primer because this part of the project required substrate sealing and adhesion support before spray polyurea application. Its role is to wet out the prepared concrete surface, reduce the influence of pores and small surface defects, and create a more stable bonding base for the following coating layer. This is especially important in desalination-related structures because chloride-containing moisture can enter weak or porous concrete areas over time, and any discontinuity at the coating interface may reduce the effectiveness of the protective system.

After the concrete-side primer route, BW3-900 was applied as the main spray polyurea protective coating. The value of using spray polyurea in this area is its ability to form a continuous, seamless and fast-applied protective membrane over large concrete surfaces and complex shapes. For the external concrete-side areas of a desalination module, this helps improve waterproofing continuity, reduce direct moisture exposure to the concrete surface, and provide a durable protective layer during handling, transport and later service.

For this project, the BW3-900 main spray polyurea coating on the external concrete-side areas was applied at 4.5 mm.

This route is therefore not simply "primer plus coating." It is a substrate-specific protection route: BW8009 prepares the concrete interface, while BW3-900 provides the main continuous protective layer. Together, they help address the concrete-side risks of porosity, moisture pathways, salt-containing exposure and coating discontinuity.

2. Internal Metal-Side / Steel-Related Protection

BW8008 Metal Primer + BW3-900 Spray Polyurea

The internal metal-side or steel-related areas required a different coating route because metal substrates face a different set of risks from concrete. In desalination and water-infrastructure projects, steel-related surfaces may be exposed to moisture, salt-containing environments, condensation, splash conditions or humid enclosed spaces. These conditions increase the importance of surface preparation, metal-primer selection and corrosion protection before the main coating layer is applied.

BW8008 was used as the metal-primer route for these areas because a concrete primer is not suitable for metal-side protection. A metal primer is needed to support adhesion to prepared steel or metal-related surfaces and to provide a more appropriate base for the following protective coating. This helps the coating system respond to the main requirement of metal-side areas: reducing corrosion risk at the substrate interface and improving bonding stability before the main spray-applied protective layer is installed.

BW3-900 was then applied over the BW8008-primed metal-side areas as the main spray polyurea protective coating. In this role, BW3-900 helps form a dense and continuous barrier layer over the prepared metal surface. For desalination infrastructure, this type of continuous coating route is valuable because corrosion protection depends not only on the coating material itself, but also on adhesion, surface continuity, edge treatment and compatibility with the actual service environment.

For the internal metal-side / steel-related areas, the BW3-900 main spray polyurea coating was also applied at 4.5 mm.

This route shows why the project used different primers for different substrates. The concrete-side areas required BW8009 for mineral substrate sealing, while the metal-side areas required BW8008 for metal-primer support. BW3-900 then served as the main spray-applied protective layer over both routes, helping maintain a more consistent protection strategy while still respecting the different substrate requirements.

3. Local Detail Reinforcement

BW6-9526 Thick-Film Detail Repair Coating

In desalination infrastructure, local details are often as important as broad surfaces. Corners, joints, edges, transitions, lifting or handling areas, local repair points and irregular details may become weak points if they are treated only as ordinary flat surfaces. These areas can experience higher stress, sharper geometry, coating thickness variation, local impact during transport, or more difficult spray access. For this reason, the project needed a material that could be applied with more control in local detail zones.

BW6-9526 was used for local detail reinforcement because it is a hand-scraped thick-film polyurea repair coating. Unlike broad spray application, a hand-applied thick-film material can be placed more precisely at corners, joints, edges and irregular details. This makes it useful where the project requires local build-up, crack or joint support, transition treatment or additional detail protection before or around the main spray polyurea coating route.

The benefit of BW6-9526 in this project is that it helps strengthen areas where coating continuity is most likely to be challenged. It does not replace the main BW3-900 spray-applied protective layer; instead, it supports the overall coating route by improving local detail treatment. This is important for prefabricated desalination infrastructure modules because handling, installation and service exposure can place stress on edges and detail areas, not only on large flat surfaces.

By combining BW6-9526 local reinforcement with BW8009 / BW8008 primer routes and BW3-900 spray polyurea protection, the project used a more practical zone-specific approach. Broad concrete and metal-side areas received spray-applied membrane protection, while details and irregular zones received hand-applied reinforcement where more precise local control was needed.

This case was not designed as a single universal coating route for every surface. It followed the real protection logic of desalination infrastructure: concrete-side areas need sealing and waterproofing continuity, metal-side areas need adhesion and corrosion protection, and local details need controlled reinforcement. Using different product routes by substrate and detail condition helps make the system more suitable for mixed-material infrastructure modules exposed to moisture, salt-containing environments, handling stress and long-term service requirements.