[spacemanspif]

Thanks guys, I kinda figured that that bit about cramming air under the car so you have confirmed my suspicions.

I figure I'll make the dam out of coroplast or plastic sheet...something that will not explode when rubbed on stuff. And if it turns out that they have gotten too beaten up I can always chop off a couple inches, add lawn edging and let the road re-do its previous work.

Now the new question is: What is a good way/material to "push" the bottom of the bumper cover out to be even with the top half?? Or would coroplast be rigid enough to not need the support of the lower half? (I doubt it would be but I'm new to this stuff)