I used coroplast for the airdam on the TDI. I installed it in march and it's holding better than I thought it would. It almost looks as good as new. I scraped it down a couple times, but it flexes nicely and comes right back in place. I can not think of an other material that could have done a better job honestly. Also, if you have a longitudinal bend in your dam, the coroplast will resist real good to transverse forces, it won't bend under the car at speed.
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