some of that spray foam is also corrosive to metal w/o the trapped water, and it really expands, so if you shoot too much in the wrong place it will distort any panel it pressures
"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
