One area of coatings that often goes overlooked is high-film-build self-leveling coatings. These are coatings that can range from 25 mils (625 microns) to 1 inch (2.5 centimeters) thick. They are 100%-solids urethanes or epoxies and are designed to go over epoxy primers for flooring applications, such as industrial settings or car parks. The reason for the epoxy primer is to address the negative reaction of isocyanates with water, which causes foaming.
In past columns, we have covered epoxy coatings, and while epoxies make great flooring coatings, high-build urethanes can provide properties that even the best epoxies struggle with, such as very high abrasion resistance, crack bridging or, in the case of aliphatic urethane systems, extreme exterior durability.
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