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Another way to get a fold in Coroplast is to run a bead of hot glue along the line. A straightedge can help guide the gun. The glue softens the Coroplast to let it bend, and then holds the angle, after some relaxation.
You can also get smooth curves, with the grain or somewhat obliquely, by slitting the inside skin in the area of the bend. I usually blunt the tip of a disposable blade for fast, easy slitting. Use it at an angle, so the cut edges will ride over each other. Stiffness can be restored by framing, or much increased by a second layer, glued on with beads of silicon seal.
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