Polyurea coating is made from a unique mixture of resin and liquid polyurethane. This hard coating is resistant to chemicals, heat and water. It is non-toxic and therefore environmentally friendly. The polyurea coating will help prevent cracking and damage by weathering as well as promote the growth of mold and algae.
Polyurea coating, such asLINE-X, are frequently used for heavy-duty applications such as tank lining, secondary containment, fuel transfer, factory floors, and even marine and shipping liners. However there’s a rising trend across various industries to apply polyurea coating to protect almost all types of new projects and equipment – including this unique whale sculpture. As reported in the article below, the New Zealand company Oceanwide applied polyurea spray on whale blubber tanks to shield them from the ravages of sea water and prevent damage; the result is an extremely durable and safe tank coat that can be used on any type of tank.
Companies applying polyurea coating must first perform an extensive surface preparation work. This includes cleaning and sanding of the finished surfaces to achieve the desired smooth finish. Subsequently, polyurea spray or line sealants must be sprayed or applied on the surfaces according to manufacturer’s instructions. Once the surfaces have been sprayed or applied, a primer must be used to seal the coating. The primer can be a paint, but many coatings include an electrostatic charge to ensure an effective seal; it also helps to improve the surface’s flexibility and provide a non-slip application. Other additional methods of surface preparation can include hot painting and hot dip galvanizing.
When polyurea coating has been applied, it must then undergo numerous curing processes. Typically, the polyurea coating is cured by heating it up to about 200 degrees Celsius. During this process, excess bonding agent is released to promote the flow of the coating into the mold cavity, and curing process can last up to two days. If the coating does not dry sufficiently in the final step of curing, the coating will need to be sprayed again. It is very important that companies performing coatings follow all necessary procedures for polyurea coating application, as some coatings are known to weaken over time.
Other common methods for polyurea coating application include cold roll cure and hot air cure. Cold roll cure uses a high-speed electric oven to speed up the drying time while hot air cure uses a pressurized hot air compressor to speed up the drying process. Some polyurea coating applications can use both methods. Once the coating has cured to a desired physical state, it can be spray tested.
Although polyurea is more expensive than epoxy, it is more durable and stronger. This is because polyurea is made of polymers rather than pure polyurethane. Therefore, polyurea coating is not subject to the wear and tear caused by continuous usage of typical polyurethane products. However, it may be difficult to apply polyurea coating to areas with sharp edges. Polyurea also cannot be used on smooth surfaces as it can be easily distorted during the curing process.