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 59010 6" Dia. Non-Vacuum Dynorbital-Spirit Random Orbital Sander, 3/8" Orbit
Dynabrade 56316 3" x 4-1/4" Vacuum Dynabug II Disc Pad, Hook-Face, Short Nap
Dynabrade 50750 Spacer
Dynabrade 02679 Shield
Dynabrade 52721 Cone or Plug 6" (152 mm) Extension Wheel Grinder, 18,000 RPM, 3/8"-24 Male Thread Spindle
Dynabrade 50947 - 8" (203 mm) Dia. Non-Vacuum Wet/Dry Sander Disc Pad, Hook-Face, Short Nap
Dynabrade 07109 Vane Set (5pk)
Dynabrade 92209 1/8" W x 12" L 220 Grit A/O DynaCut Belt, 50/pack
Dynabrade 90410 1/8" W x 24" L 180 Grit A/O DynaCut Belt, 50/pack
Dynabrade 94990 1/4" Female Composite-Style Coupler with 1/4" Male Plug Assembly
Dynabrade 18426 Vane Set (4pk)
Dynabrade 45294 Drop-In Motor
Dynabrade 52934 1/4" Drill, .4 HP, Rear Exhaust, 3,600 RPM
Dynabrade 93918 3/4" x 3-48 Female Center Thread, Very Fine, Dynabrite Surface Conditioning Eyelet Star, 50/pack
3M 08023, Adhesive Sealant 740 UV, White, 600 mL Sausage Pack, 7000000933, 12/Case 
