I used plastic sign board as a doubler/backing to repair the sagging carboard on my J10. But it eventually warped from the heat beatng down on the roof panel. It last six or seven years before failing.
When I get the new liner from BJs, I'm planning to cut 1-2 inch wide strips from the thin springy sheet steel used for the case of an old cloths drier. I think three fore and aft strips glued to the top side of the card board will be adequate to help maintain the shape for an extended period. I'll have to devise a way to hold the curvature before fastening them to the panel. Will probably drill holes in the strips and maybe use hot glue as fasteners. Depends on what the fabricator uses for the card material.
J10 - Body channel (3 inch drop @ front); dechromed; shaved side parking lights, antenna, and hood trim bar. Ford mirrors, roll pans, side exhaust, 16 inch wheels, custom dash, new interior, Edelbrocked 360, HEI, T18/208 (J20), rear disk brakes, goose neck and bumper hitches.
Last edited by Towtruck : 11-05-2019 at 09:39 AM.