I've not seen Kevlar webbing on roller furling, but then again I'm not on expensive boats either. I would be concerned that it would make over-wraps on the drum common, and difficult to clear. Also, my stanchion blocks are set-up for 3/8" line, not webbing. I wouldn't worry about UV damage because real Kevlar is impervious. The damage to 3D molded sails is to the other plastics in the sail cloth, not the Kevlar reinforcing fibers. Do any of you have experience with flat Kevlar on a roller furling application?