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      What color is the underside of the 10 ft. SM-Rib Galvalume Steel 29-Gauge Roof/Siding Panel in Slate?

      It is the mill finish from the factory.

      The underside of the 10 ft. SM-Rib Galvalume Steel 29-Gauge Roof/Siding Panel in Slate is not painted. It is the mill finish from the factory.