> SG tubes are basically disposable once opened, since they'll be useless when they glue themselves shut or crust up. You can greatly extend their lifetime by

> SG tubes are basically disposable once opened, since they'll be useless when they glue themselves shut or crust up. You can greatly extend their lifetime by storing them in the freezer. The metal ones then die by leaking once you have used them a few times, but the plastic ones can be used for years if needed.