I think it did make the spinnaker more slick. We could really tell a difference when flaking it. However, it did very little to solve our spinnaker extraction problems...but I didn't do the sock too - perhaps that would make a difference? I'm about to do an in-depth snuffer study to try and figure out why that N20 spinnaker balls up so badly and becomes a PITA with that mid-pole snuffer. It's like birthing a baby every time you try to hoist it.