you might not have much luck with foam against the hot/cold/hot/cold metal - could try really saturating it so the glue doesn't all just get wicked into the cells, but I'd use some Reflectix, the foil covered bubble pack stuff, in place of foam

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot