I was thinking $100-200 for the full car. That's what I've read it usually costs, at least. I've seen a full car ClearBra quoted at somewhere around $2000. I have no idea how long a full car worth of Plasti-Dip would actually last, but if it lasts long enough and protects the paint well enough, it might work?
Then again, $125 for a real ClearBra on the hood seems pretty cheap so that might be the better option to go with.