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This specification contains performance requirements for a two-component, weatherable polyurea topcoat. The coating may be fast or moderately fast drying (see Paragraph A1 of nonmandatory Appendix A). Coatings meeting the requirements of this specification are generally suitable for exposures in Environmental Zones 1A (interior, normally dry) 1B (exterior, normally dry), 2A (frequently wet by fresh water, excluding immersion), and 2B (frequently wet by salt water, excluding immersion). Resistance of polyurea topcoats in Environmental Zones 3B (chemical exposure, neutral) and 3C (chemical exposure, alkaline) will vary based upon formulation. The coating manufacturer should be contacted for specific chemical resistance data if required. The specified coating is intended for application by brush, spray roller, or plural-component equipment, depending upon its formulation. It is generally applied over a primer or intermediate coat. This coating is intended for use as a topcoat over ferrous metal and cementitious substrates that have been suitably primed.