3M™ 550 Fast Cure Polyurethane Sealant (various options)

3M™ 550 Fast Cure is a versatile, fast-curing polyurethane adhesive sealant, designed for permanent bonding and sealing of various materials. Thanks to its flexible, moisture-curing formula, it is ideal for both above and below waterline applications. The product is available in white, grey, and black colors, and in two capacities: 310 ml and 600 ml, allowing for easy adjustment to the project scale.

Technical Specification

• Colors: White, grey, black
• Capacity: 310 ml (cartridge), 600 ml (foil sausage)
• Product type: Polyurethane adhesive-sealant, fast-drying
• Skinning time: 60–90 minutes
• Curing: Moisture and chemical
• Paintable: Dry and after curing
• Application: Interior and exterior, above/below waterline

Application

• Sealing and bonding expansion joints (vertical and horizontal)
• Installation and sealing of doors, windows, frames and facades
• Bonding concrete, wood, aluminum, painted metals, polyester, glass and stone
• Construction, industry, transport, facade systems
• Applications exposed to weather conditions and moisture

Benefits and properties

✅ Fast curing – enables efficient assembly work
✅ Material versatility – bonds various substrates without priming
✅ Paintable – aesthetic finish after curing or even "dry"
✅ Resistance to external conditions – excellent resistance to moisture, UV and temperature
✅ Non-staining formula – ideal for use with natural stone and decorative materials
✅ Flexibility and durability – compensates for structural movements, does not crack or delaminate

Application Tips

Apply to clean, dry, and degreased surfaces using a cartridge gun or sausage gun. Smooth before skin formation begins (60–90 minutes). The product is paintable after full cure or "dry" after approx. 10–20 minutes.