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 79031 1/2" W x 18" L 60 Grit A/Z DynaCut Belt, 50/pack
Dynabrade 95676 1/4" Female Coupler with 1/4" Male Plug Assembly
Dynabrade 90353 3-1/2" W x 15-1/2" L 60 Grit A/O DynaCut Belt, 10/ pack
Dynabrade 25398 Housing Assembly for 54785
Dynabrade 95842 Dynabrade Air Lube 10W/NR, 1 Pint
Dynabrade 50947 - 8" (203 mm) Dia. Non-Vacuum Wet/Dry Sander Disc Pad, Hook-Face, Short Nap
Dynabrade 40611 Electric Dynafile II Abrasive Belt Tool Versatility Kit
Dynabrade 91143 1/2" W x 18" L 40 Grit A/O DynaCut Belt, 50/pack
3M 53602, Paper Masking Tape 2214, Tan, 48 mm x 50 m, 5.4 mil, 24 Rolls/Case, 7100245636
Dynabrade 32011 "Y" Inlet
Dynabrade 95541 Grease Gun
Dynabrade 01024 O-Ring
3M 80510, Roloc Disc 777F, P120 YF-weight, TR, 1 in, Die R100N, 7000045622
3M 14343, Marine Adhesive Sealant 4000 UV, Black, 600 mL Sausage Pack, 7010309931, 12/Case 
