My main sail is old and a little stretched out but no tears or damage and is still a decent weekend cruising sail. Its loose footed and takes quite a bit of force on the outhaul to get the foot reasonably flat. Was flaking the sail to cover it up until i can get back out sailing maybe next weekend. Wondered for the first time whether i should release the tension on the outhaul to keep from further stretching out the foot of the sail permanently? Is it possible to permanently stretch a sail like this, or is it really not an issue? I'm pretty sure its Dacron. Something I would think as a medium weight cloth, but not 100% sure. Its definitely not canvas.