I would recommend backing these oversized signs up with plywood or stakes in the middle as well as the sides. A 4x8 sheet can act like a large sail in the wind, so if not properly attached, there might be a problem with it blowing away. The best way to go is to screw it onto a piece of plywood before proping it up with stakes. We print all of our large yard signs on corrugated plastic with full color printing. These can be great during politcal sign season to put the face of your polititian on with the slogan next to them.