I'm a bee keeper I have melted wax and let it soak in the zippers and that didn't help when a wet sloppy snow melted thru the day and froze in the evening be fore I would get out of the blind.
Tried dri slide and a Remington oil that dry's also and none of that stuff would work in those really wet freezing stuff. Had a friend said to buy a 2 quart thermos and fill with hot water to unfreeze the zippers. Why don't I just build some perment stand blinds? OH that's right I did and even made one portable I can move it with the ATV or pull it in place alone for a short distance.
As long as people keep buying those blinds with open zippers they will never fix them. I suppose that 40 of the 48 continuance states never get the weather we do during fire arm deer season.
Al