Dream, Design, Deliver with our 3M™ VHB™ Tape 4991. It is a grey, 2.3 mm thick, multi-purpose acrylic adhesive with a conformable foam core. It can replace rivets, welds and screws. The fast and easy to use permanent bonding method provides high strength and long-term durability. It offers design flexibility with its viscoelasticity and powerful ability to bond to a variety of high and medium surface energy substrates.