Description3M Dual-Lock Reclosable Fasteners – SJ3540 250. Bonds to most surfaces for internal applications and utilises a rubber adhesive. This tape has a black fastener with mushroom shaped stems. Backed with a rubber based pressure sensitive adhesive. Designed to bond to many plastics, powder coated paints and other low surface energy materials. 3M Dual-Lock Reclosable Fasteners – SJ3540 250 opens and closes 1000 times, before losing 50% of its original tensile strength. To view our 3M range, click here.