corrugated metal rust

To make corrugated metal rust use the marquee tool and make a thin rectangle in middle of the canvas. Then select the gradient tool and make sure its on reflective. click and drag from the middle of the rectangle horizontally to the edge of the rectangle and let go. Then edit - define pattern. After this make a new layer and select filter render clouds. Then make another layer and select the brush tool and make the colour the a deep rusty orange, then reduce the opacity of the brush and colour vertically in the areas you want.