I use Joe Littles Tie Master, made in Mill Creek especially for superline and is a couple bucks or so delivered. Ties knots in the stuff quick and the knot never breaks, only the line if you abuse it. Back it with 20 pound mono and use the a double version of the same kind of knot. Have gotten damn near spooled a couple of times and the backing knot holds fine also. This also ties a two turn mono knot that beats any knot anywhere, and it's so quick I pretty much use it all the time now. I cut the stuff using a pair of metal cutting scissors that you can get cheap at Harbor Freight Tools - these are the same things I use to cut goose wing and leg bones with.