I thought about it for the front because the way the holes in my front bumper are, in order to be able to easily mount them and have it be relatively flush with the front of the bumper, I needed something with a good bit of depth to it and insulation boards seemed to be the best solution because my bumper isn't exactly flat so I needed to be able to get it to be one shape on the back and another on the front, I wanted it to be as clean as possible, so not just cardboard stuck on the front of the car. As for using it as a wheel skirt material, it's mainly just because I have a TON left over from the bumper and want to use it up. If there's an economical way of doing this then I want to do it, otherwise I'll just move to plan B which was this plastic sheet stuff I found at home depot that's used to cover overhead florescent lights.
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