Our solution is the write-n-seal label:
This design takes the flexibility of quick notation and couple it with long term durability. Our face stocks are coated to be indelible and non-smudging. This allows them to accept a wide range of handwriting and stamps. We then build into each custom label a clear self-laminating LabelShield. When you are ready for the notation to be protected, simply remove the exposed liner, and press down the LabelShield. The information remains visible, but secure.