I noticed, that when a mast of my ship or a companions ship breaks (so sail status goes down to like 40%) and we finish the battle, the sails are on 100% after a few days, even if I don't have enough sailcloth with me for this.
I also had this strange situation:
Again, my mast broke from a battle, after I finished I sailed to Jamaica.. when I entered 3d mode, my mast was there again (nothing new) and my sails at maybe 70% (which is possible because I had some sailcloth with me).. at Port Royale were 2 pirates atm, and one of them fired a salvo at me. One or 2 shots hit me and in this moment, my sails went up to 100%, without repairing and without sailcloth.. only because a cannonball hit me?
I also had this strange situation:
Again, my mast broke from a battle, after I finished I sailed to Jamaica.. when I entered 3d mode, my mast was there again (nothing new) and my sails at maybe 70% (which is possible because I had some sailcloth with me).. at Port Royale were 2 pirates atm, and one of them fired a salvo at me. One or 2 shots hit me and in this moment, my sails went up to 100%, without repairing and without sailcloth.. only because a cannonball hit me?