This is Aurora Tang's method of sealing up her balloons. I think its the best I've seen. It was developed during a project to document Robert Smithson's Spiral Jetty with the Getty Institute. She has used it extensively for landscape photography.
- Put a cable tie around the balloon neck, holding it in place around the helium nozzle.
- When balloon is full, pull the balloon neck off nozzle while tightening cable tie.
- Run balloon neck through steel ring and fold back on itself, wrap another cable tie around doubled back balloon neck and tighten.
- Add another cable tie.
These parts are included in the PLOTS balloon kit, only with re-usable cable ties.
