I was searching on this website if there are any problems with an automatic vinyl cover and having high FC. This is our first year with our pool and auto cover, reading several articles online, I found there "could" be some damage to the vinyl cover with high FC. Although I couldn't actually find what "HIGH FC" meant, I believe high FC might be over 10 or near Slam FC. For those with an auto cover for several years, I wondered if you noticed anything in your vinyl. Thanks,