[Christ]

Wow, I didn't even know this was split off... LOL

I never tried it with a belly pan, but given the proper insulation, I'd have to say it would work just fine to keep the heat away from the coroplast, so that you'd not have to worry about melting/fires under the car.

A friend of mine suggested using fiberglass insulation batts in the R13 variety and wrapping them up with foil tape in a helix pattern (winding it around the pipe). I'm almost certain this is just too thick of insulation, but it won't add much weight to the car. You have to use the stuff that doesn't have the paper backing on it, though.

PS - use either corn starch or baby powder on your skin before handling fiberglass. It will stop it from getting into your skin and itching.