[Lurker]

It seems to me that making the ‘hinges’ out of carbon steel would take care of this problem. They wouldn’t last very long down there.

[BlueDragon]

For wire traps, in some locales, soft metal zinc-like brads or crimps are used to assemble the panels, so that the crimps will fail after a few months or so. It's not perfect, but it's better than nothing.

Dipping the entire trap in tar tends to negate that strategy.