Although coating applications using polyurea elastomeric products bring many benefits such as fast-curing time, tolerance to fluctuating and low temperatures, and resistance to acids and physical damages, some of these properties also pose certain disadvantages.
Below are some of the limitations in the application of polyurea elastomeric coatings:
1. Because the coatings are highly-reactive and fast-curing, the surface may not get enough moisture before the applied coating sets. This can result in poor adhesion that can potentially lead to coatings failure.
2. Polyurea elastomeric coatings may react to UV radiation, due to one of its isocyanate polymer component. Top-coating surfaces with these polyurea elastomer formulations may lead to discoloration and chalking. Although the performance is unaffected by the reaction, applications that are concerned with aesthetics may not find the coatings’ appearance satisfactory.
3. Polyurea coatings cannot be used directly in underwater applications. Although they are applicable in moist environments, they do not work properly with direct application to water-logged surfaces.
4. Specialized skill and equipment are required to apply polyurea elastomeric coatings. Regular sprayers cannot provide the high temperature and pressure requirements necessary during application. Consequently, to use the special sprayer equipment requires the right degree of application skill. This means applicators need to undergo proper equipment training.
