I've used AA on my fly lines and have ruined several of them. One became soft and unusable, with another the coating became brittle on a brand new line and cracked, while other brand/type lines it performed very well! I guess it depends on the line. I now use Zipcast on all my fly lines and find it to works very well at cleaning my lines, making them slick, and making them last. The choice is yours.....Russian Roulette anyone?!?