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 59023 5" Dia. Self-Generated Vacuum Dynorbital-Spirit Random Orbital Sander, 3/16" Orbit
Dynabrade X62HS 6" Dia. Non-Vacuum Dynorbital Extreme Random Orbital Sander, Hook Pad W/ Speed Regulator
Dynabrade 91748 DynaMesh 11" 80 Grit Hook & Loop Discs, 25 per box
Dynabrade 50986 Spacer
Dynabrade 78724 3/8" x 3/4"-B52 Dynacut A/O Mounted Point, Vitrified, 5/pack
Dynabrade 93534 3" Mandrel for Sanding Stars, 3-48 Male Thread
Dynabrade 53106 Central Vacuum Drill, 950 RPM, 1/2" Chuck
Dynabrade 63991 - 4" 90 Dur. Contact Wheel Kit SuperFinisher
Dynabrade 78538 3/4"Dia. 2-Set, 3-48 Female Center Thread, 80 Grit, Dynacut A/O Overlap Slotted Disc, 100/pack
Dynabrade 93662 5" Dia. x 3/4" Center Hole, 40/50 Grit Gulleted/Slotted Diamond Cut-Off Wheel
Dynabrade 40378 Rubber Drive Wheel, Mini Dynafile II
Dynabrade 01794 Rubber Drive Wheel
Dynabrade 78055 1" W x 24" L Medium NWN DynaBrite Belt, 10/pack
Dynabrade 31949 Vacuum Hose Ass'y, 3/4" Vac, 5/16" Air Hose
3M 62816, Adhesive Sealant 760 UV, White, 600 mL Sausage Pack, 7000046609, 12/Case 
