So as I learned last year this happens since PLA can get close to it's melting point in bright sun on a hot day. I had this idea last October but my Mirage was in storage until a month ago and only got to it now.
Uhh, what a waste, turn lemons into lemonade time I had attempted to cook them flat in my black car with middling success on a hot day last August explaining the difference in appearance.
First put your warped pieces briefly back on your Mirage to be sure of their orientation. I wrote P, M, and D on them to indicate position later.
I cut a 25.5*1.5"(648x38mm) coruplast piece to shape. Make sure the ribs run end to end for strength.
I had a feeling a sharp impact would break it cleanly. So get a hammer and chisel(or sacrificial flat blade screwdriver) and cut them down to size.
See where this is going. Paper is much easier than coruplast to form and recyclable
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Why are the upload sizes for files stuck in 1997 with a little 330 kb jpg more than triple the allowed jpg size?
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Change the file extension of the .pdf attached to this post to .jpg print it at 100% and 300 dpi and you won't have to iterate to the form by trial and error
Next trace it onto your coruplast, flip it 180 and trace the other half. Then cut coruplast to size.
Test fit, mark the coruplast where the clips line up. Will come in handy in the next step. Remove the clips and stick two pieces of duck tape to the back of each of the salvaged clips. Then put the back on the car, then carefully install the coruplast and tightly tape it down as you fight not to have a duck tape mess.
Remove newly created assembly from car wrap over duck tape with another layer so the seam is on the back this time. Then put a continuous strip of duck tape over the front. I chose white duck tape in the hope it'll stay cooler in the sun and save the PLA from further warping.
Before and After. If this nets a tenth an MPG and doesn't fall off I'll call it a sucessful mod of a mod!