I believe I read about this in the ancient past (more than 5 years ago). Someone was selling sheets of a rigid backing material for upholstery panels that was totally trick. This material was 1/8" to 3/16" thick, and was scored on one side into what looked like about 3/8" squares. This material became very flexible in 2 dimensions when it was wetted with a light mist of water. It could then be formed into compound curves, to follow the inner contours of a car body. It was impregnated with a chemical which became activated by the addition of this water mist, and caused the material to harden into these complex shapes. When it had dried for 2 or 3 hours, it could be removed (apparently it didn't want to stick to the interior panel it was formed on). Upholstery foam and upholstery could then be glued to it, and it became a complex shaped upholstery panel. I have done similar things with fiberglass matt and resin, but its a sticky nasty business at best.---Has anyone out there heard of this material I am thinking about---maybe a supplier???? I am about to start the rear panel/seatback for the roadster pickup, and this material would be a blessing.