I have some of that material and was disappointed with how difficult it’s been to work with. I tried to flatten it out with little success. Laid a section flat for a few days, took the weight off and it sprung half way back to being coiled up. Extensive use with a heat gun and bending, and it’s a flattish but wavy. It’s difficult to cut neatly, best success is scoring deep with a razor knife and bending to snap.
It’s actually been great for random non automotive projects
Made some nice wheel spats for my old Saturn, but used a heat gun to almost melting it to make a sharp bend like I wanted.
Actually thinking to get it out soon to make a grill block out of.
For bigger areas, if you could secure the edges and wanted a pretty heavy plastic it would be good. For a 2’ kammback, I think you would need a frame to help support or at least give it its shape
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