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I've never had it fail in normal service. I used it for a sign once where it bent a lot with every gust of wind, and it lasted two years, failing just along the crease. Once, I built a whole velomobile body from carefully reinforced light-gauge Coroplast. It was only 15 lbs for a rather large shell, as these things go. I planned it to fail gradually, and separate into parts that could be re-glued. The customer rolled it into a grassy ditch with no damage at all. A folded edge will often be more rugged than a frame and fasteners.
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