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My coroplast underpanelling has been in place since May 2006 with no deteriation problems. Since its made of thin polyethylene, it should last well in locations like the underside that don't get a lot of direct sun, but will get brittle after a few years exposure to direct sun. I've replaced all of the coroplast on the top and sides of my car with aluminum sheet, but left the underpanel, side skirts, and front wheel spoiler in coroplast for its flexibility when hitting road debris.
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