Getting a sail cover on and off a mainsail is often harder than it should be. Once it’s off the sail, it can be hard to tell which end goes where, and when you spread it out to check, the wind will wrestle you for control of it.
When taking your cover off, start at the mast and work your way back to the end of the boom. Unbutton the fasteners underneath one by one as you neatly flake the cover back on to itself. This way there’s never any loose fabric for the wind to get hold of. When you’re done, you’ll have neat slab of material that’s easy to roll up and stow away. To cover your sail again, just reverse the process. Start at the back of the boom and unroll the cover as you move forward, buttoning the fasteners underneath as you go. Once you’re in the habit of doing this, you’ll never curse your sail cover again when the wind gets blustery.