Sugru is a formable adhesive, with a consistency similar to modeling clay. It comes in small single-use packets, and cures with exposure to the humidity in the air.

Make sure you're ready to re-seal the watch when you open the Sugru, it will begin to cure in about 30 minutes.

If you have a "food saver" heat sealer, you can use this to re-seal the Sugru for later, preventing waste. Sealing one watch only uses a very small amount of Sugru.