Bostick 2402, two part chloroprene adhesive.Sticks on contact once tacky, extraordinarily strong, used for edge gluing neoprene for divers drysuits and attaching boot soles.Clean thoroughly with Isopropyl Alcohol (Surgical Spirit BP) or Acetone first, be very careful not to press the rand to the boot until you've got it positioned Just So, because it will stick and stay stuck.