Replying to Can you leave a slackline outside

I just got my slackline today, and setting it up is kind of a bitch because the tree that I wrap the line around is really thick and has a bunch of shit around it. Is it ok if I just keep the two separate lines (the one with the ratchet and the other with all the slack) tied around the trees? I somewhat remember hearing that the UV rays can damage the fibers in the line but I wanted to make sure. I googled and only found one yahoo answer article back from 2006