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5x3

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    Question Do 5'x3' Corrugated Plastic or ACM Signs Need Plywood Support?

    Hello all, For 5' x 3' signs made of either corrugated plastic or ACM panels, do they need to be back-supported by a sheet of plywood or something to withstand wind etc or will screwing them directly to a frame of the same size be enough to keep them in place? If no support is needed, what...
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