I've been using it for a while on LW polygon barrels. No leading and does not seem to decrease accuracy. I put a paper towel in the bottom of a tin and dampen it with the lube. Not sloppy wet, just a bit damp. Put the pellets in and shake around a little and they are good to go.
Seemed to decrease accuracy a little in the FX Smoothtwist barrels I've tried. They seem to like the pellets dry or maybe a wax like Krytech.
Bob