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 92115 1/2" W x 12" L 220 Grit A/O DynaCut Belt, 50/pack
3M 53534, Scotch Box Sealing Tape 313, Clear 48 mm x 1500 m, 6 Rolls/Case, 7100240703
Dynabrade 78571 1-1/2" Dia. x 8-32 Female Center Thread, 60 Grit, A/O, 3-Ply, J-DynaCut Eyelet Star, 50/pack
Dynabrade 51392 6"-8" Dia. Right Angle Two-Hand Rotary Buffer, 1 hp, 2,800 RPM, Rear Exhaust, 5/8"-11 Thread
Dynabrade 18570 Vane Set (4pk)
Dynabrade 15420 Dynafile III Abrasive Belt Tool
Dynabrade X62HS 6" Dia. Non-Vacuum Dynorbital Extreme Random Orbital Sander, Hook Pad W/ Speed Regulator
Dynabrade 79024 1/8" W x 18" L 80 Grit A/Z DynaCut Belt, 50/pack
Dynabrade 78725 5/16" x 5/8"-B53 Dynacut A/O Mounted Point, Vitrified, 5/pack
Dynabrade 59385 Hose Ass'y-ESD, 1" Vac, 5/16" Air, 3 Meters Long
Dynabrade 55525 .3 hp Straight-Line, 6" Extended Die Grinder, Aluminum Housing 30,000 RPM, Rear Exhaust, 1/4" Collet
Dynabrade 11202 Contact Arm Ass'y, 5/8" Dia. x 1/8" W, Rubber Wheel, with 1/4" W Platen
Dynabrade 92246 4" Dia. x 3/4" W Bent Medium Wire Wheel
Dynabrade 59029 6" Dia. Central Vacuum Dynorbital-Spirit Random Orbital Sander, 3/16" Orbit
Dynabrade 97570 1/2" NPT Female Safety Coupler
Dynabrade 80057 Motor Brush Set, 110/120V-60 Hz
Dynabrade 56316 3" x 4-1/4" Vacuum Dynabug II Disc Pad, Hook-Face, Short Nap
Dynabrade 53080 1/2" Right Angle Drill, .7 HP, Rear Exhaust, 3,400 RPM
Dynabrade 31968 Conductive Y Adapter
Dynabrade 91434 1/4" W x 24" L 60 Grit A/O DynaCut Belt, 50/pack
Dynabrade Nitro Series NZ1 NitroZip, Eraser Tool
3M 14343, Marine Adhesive Sealant 4000 UV, Black, 600 mL Sausage Pack, 7010309931, 12/Case 
