No I think it's the same stuff, I just had to do two layers for under the hood. Found the 1/2 thick stuff at Wal-Mart for about $2.50 a roll, I think Lowes has it too, but I'm not sure the price difference.
OH, and around the headlights I noticed there is a bracket for the lens, so I made sure to put a separate piece on that and cut out around the screw head just in case I needed to get it out one day. It wasn't as clean as I had wanted but it works for now.
I didn't even think about under the headlights! oh, and I noticed you didn't try to squeeze the weatherstripping in between the little notch and the inside of the lights coming up from the bumper, it was a pain but I got mine in there.
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