Since their introduction by researchers at Texaco Chemical Company in the mid 1980s,1 spray polyurea coatings have gained widespread acceptance in the coatings market. Spray polyurea is advantaged over alternative coatings technologies such as epoxies and acrylics because of its extreme application properties. These properties include rapid cure and return to service, low-temperature cure (below 0 °C), insensitivity to humidity, low VOC content, and exceptional physical and mechanical properties. These features, along with advances in application equipment, have developed polyurea as a leading technology in applications such as secondary containment, corrosion protection, water proofing membranes and tank linings.