Gary, you've got a point. If that trap would last for ten years without needing to be treated again, then $2 or $3 for this permanent coating would not be unreasonable. That boils down to 20 or 30 cents a year. It's still more expensive than wax/dip, but the you save eliminating that step every year ought to be worth 20 or 30 cents.
Ed (Paws-i-Trip) Medvetz was talking about this for foothold traps and he's the one quoted at $18.00 per dozen. Except… I don't think I'd invest that in foothold traps. They just take too much abuse. Gary says he waxes over them, so that's not a time savings. I could, however, see this as a bodygrip treatment.
As Gary mentioned problems with having them done with the springs compressed, and noticing loss of strength, has anybody done this to a bodygrip with the springs in the "unset" position?