3M™ Plasticizer Resistant Loop Fastener SJ3523 is one part of a two-part fastener solution designed to provide great durability for thousands of closures. With its plasticizer resistant, acrylic-based pressure sensitive adhesive backing, this fastener allows for easy and convenient attachment to a variety of substrates, especially flexible vinyls. - 3M plasticizer resistant loop fastener SJ3523 is one part of a two-part fastener solution designed to provide great durability for thousands of closures. The backside is coated with a plasticizer resistant acrylic pressure sensitive adhesive, especially suited for attachment to flexible vinyl and other plasticized materials.