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 78055 1" W x 24" L Medium NWN DynaBrite Belt, 10/pack
Dynabrade 55242 Vane Set (4pk)
Dynabrade 18426 Vane Set (4pk)
Dynabrade 56205 5" Dia. Non-Vacuum Disc Pad, Vinyl-Face
Dynabrade 95886 Washers For Vacuum Shroud (57737)
Dynabrade 51302 .5 hp Straight-Line Die Grinder, Front Exhaust, 20,000 RPM, 1/4" Collet
Dynabrade 79004 1/8" W x 12" L 80 Grit A/Z DynaCut Belt, 50/pack
Dynabrade 58997 Housing Assy for Model # 59110 Rev. H
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 91547 5" Dynacut Extreme Orange Premium Film Disc, 120 Grit, Hook & Loop, Non-Vacuum, 50/Box
Dynabrade 90614 3" W x 10-11/16" L 80 Grit A/O DynaCut Belt, 10/pack
Dynabrade 94897 Re-usable Compression Fitting Ass'y (for 8mm Hose)
Dynabrade 11004 Dynafile Screw-In Housing
Dynabrade 79808 DynaBolt AO 4" x .035" x 3/8" T1 Cut-off Wheel, Box of 10 Discs
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