A foldable tonneau system comprising: (a) a plurality of frames, each of the plurality of frames include a panel region and a hinge region; (b) a plurality of panels each connected to one or more of the plurality of frames via the panel region; (c) a plurality of hinges that extend between and into the hinge region of a first of the plurality of frames and the hinge region of a second of the plurality of frames and connect the first of the plurality of frames to the second of the plurality of frames so that two of the plurality of panels are movable relative to each other; and (d) a coating that covers all or a portion of the plurality of panels, all or portion of the plurality of frames, and a connection region where each of the plurality of panels connect to the one of the plurality of frames at the panel region so that fluid is prevented from entering the connection region.