They are waxed pretty good but will probably get dipped before I put them away.

Not to get of the salt topic. But compass sets are what I use on alot of my remakes. Works pretty good for me with that

In a pinch, will table salt work? A hard cold snap is coming and I'm out of antifreeze. And with the holidays shipping is out.

While I use waxed sand/dirt like many here, I find it isn't the total answer in my opinion.
I have gone to using an ice melter product purchased at Farm & Fleet.
Some goes under the trap before bedding. Some goes around the jaw edges/springs after bedding. Waxed sand fills in the void inside the jaws. Traps bed solid, and they always snap closed when triggered.

Zion, up in MN the corn growers assn. worked with the Ethanol plants and came up with what looks like a thin corn syrup. The MSP airport use it on runways. The MN DOT uses it on the bridge decks because it is non corrosive to the re-bar. To prob is the cost.