I wouldn't go that far, but that's just me. Undercoat is one of those things I love to hate. If not properly prepped it gives rust a nice cubby to develop when it fails. I run a small body shop. Bodymen are well known for killing boxes due to the conditions they are subjected to due to constant dust, water, compounds being thrown everywhere, etc. My first box, a Craftsman stack, I'll admit I didn't take the best care of, although it did get an occasional wipedown not much care was taken of it. That combo is around 15 years old and it started showing dreaded signs of rust on one side when I retired it. My main boxes are Snap Ons now, I take a lot better care of them than the old Craftsman with a lot more wiping them down, keeping clean, covering up, avoiding a lot of water contact. I've had one for about 3-4 years and it's not showing any signs of rust. Maybe a couple scuffs here and there but that's expected. Once a year I take both my boxes, clean them out, clean all my tools, remove the drawers, and clean/wax everything. I almost believe this has helped along with taking better care of them.
