Polyurea and polyurethane are two of the toughest and most versatile coating materials available on the market. Their names reflect their similar chemistry, which afford both materials with robust physical properties that see them used in similar or even the same applications. However, their differences remain, with each material having its own set of physical properties and performance characteristics that make them more or less suited for different projects and purposes. Deciding between the two technologies first requires an understanding of what they are, and what makes them different.