I am so glad to see the posts regarding sisal rotting on the spools. You'll see so many northeast wreck divers proudly wearing these oversized uplines, neatly wrapped with rope. The reason they chose sisal is that it is supposed to biodegrade, but of course that takes a decade or more in the ocean - look at any old anchor line or fishing net out there! But more importantly, since they have chosen a self-rotting product, unless they completely unspool the reel after every weekend of diving and dry it and store it dry, then of course the decomposition process is taking place right there on the spool. So the first time they go to use it, they tie off, get 20 ft or so off the wreck, and then 'snap', there goes the rotten line. Now we're screwed!
As a poster already noted, just use 1/8" nylon off your penetration reel which you should already have clipped on your kit. The ocean won't fill up with old lines! And you can rest a bit more assured that you'll enjoy a safer ascent. Even better, use that reel to navigate your way back to the anchor, and you'll never need an upline again!