Hello all, First post here. Thank you to all the contributors. I have learn a lot in the past few days! I am about to buy a new NeilPryde sail for my Sunfish. Just for fun and leisure. With 30-40 hrs of sailing per years, I am hoping it will last 10 years. The possibility to add a window sounds appealing. Living in Canada, I am wondering about its durability. A NeilPryde rep is telling me that Mylar may becomes brittle and cracking in cold weather. But cold is relative. I doubt I will be sailing below 10C (50F). Am I ok with a Mylar window? Also, I am not 100% convince that even in warm weather, the UV protection on it will last a decade. Any experience to share?