Poorboy...
It all depends on the climate.
In Las Vegas -- it's no sweat.
In New Orleans -- you'd better dry the mold in the oven and wrap in in Calcium Chloride. ( That's what's in those desiccant bags packed in with stuff that can't take humidity.)
Likewise, it's humidity within the charge that is frustrating ignition.
In northern climates this fact is NOT so obvious.
In Hawaii, Florida and the Gulf States: frustration knows no limits.
Penn-Union IIRC has a compression only system which makes exothermic welding ( Caldweld is a brand name for such. ) old news.
It does require their stuff and their tool. Its labor content is much, much, much lower. It's like cutting big wire with an electro-hydraulic gun. ( Gator, anyone?)
