The 3M SJ3571 hook and loop fastener is designed for both interior and exterior use. Its textile loop part is coated with a highly adhesive acrylic glue. Velcro can withstand up to 5000 cycles of fastening and unfastening. Recommended Counterparty: SJ3572 (hooks). Velcro is designed for surfaces with high surface energy (HSE): unpainted metals, glass, wood, stone, ceramics, etc.; with medium surface energy (MSE): metals painted with non-baked paints, plastics except LSE, natural fabrics, etc.