Polyurea coatings can be subdivided into two main types: aliphatic polyurea and aromatic polyurea. Their names reflect the different reagents used to create each type, as well as the key aspect of their chemical structures that’s responsible for their differences. Aliphatic polyurea is produced using aromatic diisocyanates like MDI, which possess double bonds that make it vulnerable to photodegradation. In contrast, aliphatic polyurea uses isophorone diisocyanate (IPDI), which is non-aromatic, and possesses single bonds that are less susceptible to photoexcitation. Aliphatic polyurea’s distinct chemical structure thus affords superior UV resistance that make it a powerful and popular choice of UV resistant coatings. However, aliphatic polyurea is typically more expensive, and without the same level of strength and durability provided by aromatic formulations. For the best of both worlds, we recommend opting for aromatic polyurea combined with a UV resistant top coat; that way, you’ll be saving money while also enjoying the benefits of a stronger coatings system. For those who can’t afford the time but can afford the additional expense, aliphatic polyurea remains a great option for rapid UV protection, still with plenty of protection from weathering and abrasion.