Loctite UR 3371 Multipurpose Polyurethane Sealant

Flexible, Fast-Curing, and High-Performance Bonding

The Loctite UR 3371 is a professional-grade, one-component polyurethane sealant engineered for demanding bonding and sealing applications across metals and plastics. Designed for engineers and industrial users, this moisture-curing sealant delivers reliable elasticity, strong adhesion, and excellent durability in both interior and exterior environments.

With rapid skin formation (~40 minutes) and high initial tack, Loctite UR 3371 enables efficient assembly and reduced process times. Its non-corrosive formulation and bubble-free curing ensure clean, durable joints without compromising substrate integrity. The sealant performs consistently across a wide service temperature range (-30°C to 79°C / -22°F to 175°F), making it ideal for applications such as side panelling, seam sealing, structural bonding, and joint filling.

Engineered to withstand real-world conditions, this versatile sealant provides excellent resistance to UV exposure, weathering, and environmental stress, while maintaining strong adhesion to raw metal, coated surfaces (EC and top-coats), and plastics. Its good paint compatibility further supports streamlined finishing processes.

Features & Benefits:

• Moisture-Cure Technology – Reliable, one-part system simplifies application and eliminates mixing.
• Exceptional Elasticity – Maintains flexible, durable bonds under dynamic loads and movement.
• Fast Skin-Over (~40 min) – Speeds up production cycles and improves throughput.
• Superior Adhesion – Bonds effectively to metals, coated surfaces, and plastics without primer in many cases.
• Weather & UV Resistant – Ensures long-term performance in outdoor and harsh environments.