To avoid the sticky residue left by duct tape, use 1.5“ or greater black electric tape. No messy cleanup after removing your race number.
Giving Structure to Foot straps
In cold water when wearing bulky water shoes it can be difficult to get your feet back into the foot straps. This is especially true in big waves and when you individual straps for each foot. By taping flexible, but semi-rigid rubber inside the foot straps they will hold their shape so you can quickly get your feet into position and back to paddling.
Paddles
Mounting Electronics
GPS Watches
A watch can be mounted on to the foot strap by strapping a piece of closed foam to the foot strap with zip ties. Then wrap the wrist band around the foam and the foot strap. The watch face is closer to see and to reach than mounting on the front of the footwell.