I played around with some coroplast last night. It can be bent in one direction but you have to actually slit between the ribs on the inside and it still tends to be uneven. Also, while I was washing off the dirt from the piece that has been kicking around in my garage, I noticed that it expands enough from spraying hot water on one side or the other to make it warp. Don't know if the sun would ever make it wrinkle but it seems like it could. Luckily, my local race car supply shop sells .025" aluminum in 3x8' sheets for a mere $19. So it looks like my tail will be shiny.
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