Aromatic Polyurethane Base Coat

U91 Aromatic Urethane

Maximum adhesion and durability

Gaco U91 is a single-component aromatic urethane, liquid-applied roof coating designed as a base coat for the Gaco U9 Series Urethane Roof System. It is the ideal urethane to build the body of the roofing system and can be used over most substrates. It provides excellent adhesion and tensile performance. U91C is an additional option available, which is Low-VOC compliant in all 50 states.

Roof Maintenance

U91 may be brush-applied, rolled, or spray-applied and meets the requirements of FM coating specifications as part of a three-part system. The Gaco U9 Series Urethane Roof System consists of the UF90 GacoMastic reinforced urethane mastic for seams, penetrations, and detail work, the U91(C) Aromatic Urethane base coat, and the U92 Aliphatic Urethane top coat. Three coats are recommended for most roof coating applications with the finish coat being the U92 Aliphatic Urethane. The coating surface can generally receive another coat within 10-12 hours, and may be walked on within 24 hours.

Gaco Urethane Coatings offer the best combination of durability, tensile strength, and versatility. Expect excellent protection from UV, moisture, extreme weather, and foot traffic. Combining the U92 Aliphatic Urethane top coat with the U91 Aromatic Urethane base coat provides maximum durability and reflectivity for long life and improved energy efficiency. 

Roof Replacement

The U9 system may also be combined with GacoRoofFoam for a total roof replacement solution. You can complete re-roofing projects or install a new roof using the Gaco Sprayed-in-place Polyurethane Foam (SPF) as insulation and the Gaco U9 Series Urethane Roof System for a fraction of the cost compared to traditional roofing systems. 

Remember to put Gaco’s premium solutions to work for you. Gaco coatings are backed by industry-leading warranties*, international expertise, and a team of in-market experts who are local to you. At Gaco, we believe there’s a difference between just any solution and the right solution. You deserve the right solution and Gaco’s team of experts will help you find it! Find U91 near you or contact your local Gaco Area Manager with questions.