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 78049 1/2" W x 24" L Coarse NWN DynaBrite Belt, 10/pack
Dynabrade 90272 3-1/2" W x 15-1/2" L 60 Grit A/Z DynaCut Belt, 10/ Pack
Dynabrade 90410 1/8" W x 24" L 180 Grit A/O DynaCut Belt, 50/pack
3M 93947, Scotch Stucco Tape 3260-A, 1.88 in x 60 yd (48 mm x 54.8 m), Stucco Tape, 7010384961
Dynabrade 79195 3-1/2" W x 15-1/2" L 36 Grit DynaCut Premium Ceramic Belt, 10/pack
Dynabrade 07107 Vane Set (5pk)
Dynabrade 97060 Lever Pivot Pin, M2.5 x 24
Dynabrade 25234 Vane Set (4pk)
Dynabrade 92847 3" Dia. x 2-1/4" W Standard Dynacushion Pneumatic Wheel
Dynabrade 78861 Crimped Wire Radial Wheel Brush 2" Dia. x .0118 x 7/16" Steel
Dynabrade 52474 Vane Set (4pk)
Dynabrade 79824 3" P2500 Grit Dynasoft Finishing Film Non Vac Hook Face Disc, 50 per box
Dynabrade 97118 Shim
Dynabrade 54391 .7 hp Extended Right Angle Die Grinder, Rear Exhaust, 18,000 RPM, 1/4" Collet
Dynabrade 82576 1/4" W x 24" L 80 Grit Ceramic DynaCut Belt, 50/pack
3M 60894, Impact Stripping Tape 500, Green, 1 in x 10 yd, 36 mil, 9 Rolls/Case, 7000001170
Dynabrade 56177 6" Dia. Non-Vacuum Disc Pad, Vinyl-Face
Dynabrade 79689 8" 180 Grit, Extreme Orange Hook & Loop Disc w/8 Vac Holes, 25 per Box
Dynabrade 78860 Crimped Wire Radial Wheel Brush 2" Dia. x .006 x 7/16" Steel
Dynabrade 93252 8" Dia. x 1/2" Center Hole, 400 Grit, A/O, Arbor-Mount Sanding Star
Dynabrade 22070 Downdraft Table Accessory Pack (Air Manifold, FRL and On/Off Air Valve)
Dynabrade 50947 - 8" (203 mm) Dia. Non-Vacuum Wet/Dry Sander Disc Pad, Hook-Face, Short Nap
Dynabrade 57571 3-1/2" Dia. Wet Dynorbital Supreme Random Orbital Sander, Deluxe, 3/16" Orbit
Dynabrade 11032 1/4" W x 7" L Soft Platen Pad 5-Pkg. 
