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 93342 Carbide Burr, 1/8" Dia., SD-42 D/C Burr, Ball Radiused End, 1/8" Flute L, 1/8" Shank
3M 54336, Particulate Respirator 8293, P100, 7000002055, 20 EA/Case
Dynabrade 92149 1/2" W x 18" L 60 Grit Ceramic DynaCut Scalloped Edge Belt, 50/pack
Dynabrade 78490 4" Dia. x 1", 1/4-20 Female Center Thread, A/O, 80 Grit, 8-Ply J-DynaCut Cross Pad, 100/pack
Dynabrade 91548 5" Dynacut Extreme Orange Premium Film Disc, 150 Grit, Hook & Loop, Non-Vacuum, 50/Box
Dynabrade 78501 1" x 1/2", 8-32 Female Center Thread, 60 Grit, 8-Ply, Dynacut A/O Square Pad, 100/pack
Dynabrade 25230 Gear Set- 1.176: 1 Ratio, 1.3Hp
Dynabrade 78705 1-1/2" x 8-32 Female Center Thread, Medium, Dynabrite Surface Conditioning Eyelet Star, 50/pack
Standard Abrasives 831610, Buff and Blend Hook and Loop GP Disc, 5 in A MED, 7000046842
Dynabrade 22090 2-3/4" x 5" Hand Sanding Block
Dynabrade 57814 3-2/3" W x 7" L Dynabug Orbital Sander, Central Vacuum, .28 HP, 10,000 RPM, 3/32" Orbit
3M 14343, Marine Adhesive Sealant 4000 UV, Black, 600 mL Sausage Pack, 7010309931, 12/Case 
