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I rub a bar of soap on the teeth of the zipper and it seems to work well.
I'm going to try pure Bees Wax.
I would think that would lock a zipper up when cold.
That's what I do as well.I use it on my fabric garage door zippers as well.Works great down to -70!!!!!
Dawg; they had zippers when you were 5? wow. lol
bowstring wax works well and it's cheap