A friend of my wife's offered us her old Thermarest sleeping pad. Her parents run an outdoor/camping/army surplus store in central Illinois so I figured she would have stored it 'properly' (unrolled) all these years. Sadly, she did not. It's been rolled up for at least 10 years, if not longer. At this point, will it "come back to life" if I unroll it, inflate it and let it sit like that for a few months (until I plan to use it, this Summer)? Or, is it shot? TIA, Dave.