3M 7100200259 Polyurethane Sealant 540 White

Product Description

The 3M 7100200259 is a one-component, moisture-curing polyurethane sealant that forms permanently elastic bonds on contact with ambient humidity. Sold as 3M Polyurethane Sealant 540 in white, it is engineered for sealing and bonding applications where long-term flexibility and adhesion are required. The sealant cures without mixing, making it straightforward to apply in the field. It adheres to a broad range of substrates including plastics, fiberglass-reinforced plastic (FRP), sheet molding compound (SMC), aluminum, steel, coated metals, and wood. Trade professionals in HVAC, construction, and general mechanical service use this product for weatherproofing, panel bonding, and structural sealing tasks.

This sealant is suited for both residential and light commercial applications where a durable, flexible seal is needed against vibration, moisture, and thermal movement. Typical install scenarios include sealing penetrations, joining dissimilar materials, and bonding panels in environments exposed to the elements. Its white color makes it appropriate for visible joints on light-colored surfaces.

Key Features

• One-component formula — no mixing required, ready to apply from the container
• Moisture-curing chemistry forms a permanently elastic, flexible bond
• Adheres to plastics, FRP, SMC, aluminum, steel, coated metal, and wood
• White finish suitable for exposed joints on light-colored substrates
• Designed for sealing and bonding in applications subject to movement and vibration

Compatibility

Designed for bonding and sealing applications involving plastics, FRP, SMC, aluminum, steel, coated metal, and wood substrates where a permanently elastic polyurethane seal is required.

Installation Notes

Surface preparation is critical — clean all substrates free of oil, dust, and loose material before application. Apply using a standard caulking gun and tool the sealant to the desired profile before a skin forms. Allow adequate cure time based on ambient temperature and humidity before exposing the joint to stress or moisture. Follow applicable building and mechanical codes for sealant use in your jurisdiction.

Technical Specifications

• Product Type: One-Component Moisture-Cure Polyurethane Sealant
• Color: White
• Weight: 11.89 pounds
• Unit of Measure: Each
• UPC: 00021200490583

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100200259