- Taking the sail down and storing either in the cabin, or better, at home is the best answer if you won't be sailing until spring.
- You can barber pole the sail with a spare halyard... but this guy did that and it wasn't enough.
The root cause was a failed UV cover, but poor furling contributed.
- Furl tightly and wrap the sheet a few times.
- Check the condition of the UV cover. If it starts to fail it will balloon and pull the sail open.