Multi Purpose Sealant with Good UV Resistance
3M Polyurethane Sealant 540 is a single component, moisture curing, polyurethane sealant used to bond a wide variety of materials, including plastics, fiberglass reinforced plastic (FRP), sheet molding compound (SMC), aluminum, steel, coated metal and wood. It exhibits high tensile strength, good UV resistance, low Shore A hardness and low modulus to maintain its functionality in a wide range of extreme service environments. Available in cartridge, sausage pack, pail and drum volumes to meet your application needs.
Recommended Applications
- Vertical and horizontal panel bonding and joint sealing
- Aluminum curtain walls and storefronts
- Transportation manufacturing (bus, rail, truck, trailer)
- Replacement of mechanical fasteners in many situations
Paintable after Skin Forms for Improved Appearance
3M Polyurethane Sealant 540 offers an alternative to mechanical fasteners and can replace rivets in some applications. It will bond dissimilar substrates and a wide selection of materials. This will perform in temperatures ranging from 40?F/ 40?C to 194?F/90?C. Once skin forms (60 90 minutes), the sealant can be painted to improve the final finish.
Understanding Polyurethane Sealants
Polyurethane sealants provide strong, flexible durable elastomeric bonds that seal against the elements. These sealants excel in challenging industrial, transportation and construction applications. Polyurethane sealants are available in a wide variety of Shore A hardness, open time and colors to meet many application needs. Choose a 3M Manual or Pneumatic Applicator for dispensing 3M adhesives sealant cartridges and 400ml/600ml sausage packs.
Bringing Better Ideas to the Surface through Science and Innovation
In our 3M Industrial Adhesives and Tapes Division, we apply the science of adhesion to deliver innovative solutions that improve the design and manufacturing processes of companies around the world. In the end, our technologies help customers like you deliver competitive products to the market faster and more efficiently.

Dynabrade 56884 5" Dia. Central Vacuum Dynorbital Supreme Random Orbital Sander, 3/8" Orbit
3M 27571, Adhesion Promoter 4298, Sponge Applicator Packet, 2.5 cc, 7000002020
Air Turbine Tools 0145SSV - 1/8" Angle Hand Tool Series 65,000 RPM, 35062
Air Turbine Tools 525SV - 6mm Straight Hand Tool Series with Brake, 40,000 RPM, 32545
Dynabrade 59020 5" Dia. Non-Vacuum Dynorbital-Spirit Random Orbital Sander, 3/16" Orbit
Dynabrade 56880 5" Dia. Non-Vacuum Dynorbital Supreme Random Orbital Sander, 3/8" Orbit
Air Turbine Tools 202SV - 1/8" Straight Hand Tool Series, 30,000 RPM, 32230
Air Turbine Tools 525XSV - 1/4" Straight Hand Tool Series with Brake, 30,000 RPM, 42534
Air Turbine Tools 206XDM - 1/4" Straight Hand Tool Series with Brake, 40,000 RPM, 42979
Insize 6841-170E, GRANITE DIAL INDICATOR STAND (BASIC TYPE), without fine adjustment, 6940561974546 
