I've been using Lexjet's Toughcoat Thrifty Banner material, 16 mil I think, their tape, and their sunset glossy coating, then apply grommets
banners printed held up well in eastern NC sun for 6 months already
way too much labor / cost, though, to compete with sign companies using solvent ink, which is cheaper and better suited
and text only makes ratio even worse to compete, full color with a nice graphic background, that's what I've been doing, and only for nonprofits where I've been only getting my cost back
offtopic a bit, Lexjet's satin cloth is great for trade show banners and we have done a few of those with nice results