As far as covering the front of the car ..I don't know.
This is plastic we are talking about and plastic melts ( and catches fire ) next to hot engines.
If I cover under my engine I plan to have a section of aluminim under the actuall hot bits. I did this once before. I created a full belly pan extending from the front bumper all the way to the door of the car.
I used aluminum bracing and riveted aluminum sheet metal to it.
When driven along, it all worked great, but when the car sat at idle ( like at a stoplight ) it made a horrible rattling sound from the vibrations in the sheetmetal.
I soon removed it. ( I was also worried about the effects of water puddles and other objects ripping the sharp metal off and hurling it into the guy behind me . )
Well, my accord is actually quite low as is. If I go any lower, I'll be afraid of speed bumps and dirt roads!
Your the second person I've heard mention that coroplast underneath has quited down the ride. Where do you actually get coroplast though? I went to Home depot and asked the guy, only to get a funny look back.