3-Point seatbelts into a '64 Dart hardtop?

What about a towel drenched in cold water placed on the painted side, would that be enough to keep the heat from penetrating the paint?
I really don't know, just thinking of options.
Honestly anything that you do to dissipate heat is a good idea. A cold towel placed around the welding area and a cold towel on top with some ice on it would help. the towel prevents scratching and the ice absorbs a bunch of heat. But, the roofs are pretty thin sheet metal (at least mine is), so even that might not be enough.