Ah ok, so far I have used coroplast and it has worked wonders due to its lightweight easy to shape design and also being able to get it for free from my local politician's office was a real nice bonus! It turned out to be a bit thicker and more resistant to bending than the coroplast I bought (not to mention expensive) so I'm really happy for the donation. I used bolts and nuts to get the coroplast in and so far it has worked nicely. I also used zip ties to sow the different pieces of coroplast together to make my air dam so if you are unable to find a large piece, then you can try and use zip ties to mend pieces together in an overlapping fasion.
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