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. Multi-Purpose Sealant with Good UV Resistance.
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.
Gap filling capability. 60-90 skin time; paintable, once skin forms.