When I ordered my seats from Airtex I comment to Dodd Stretch the owner that I was removing the springs and going to use ceconite on the seat bases. He said to use the seat support material that they sell for that purpose. Still made from polyester but much heaver, higher strength fabric that you attach with contact adhesive. I haven't installed it yet but it is the same as what Cessna used on later model seat frames.
Tim



