My only experience with a wax on a garment is the Australian Duster (Kakadu brand), which I've had for nearly 20 years. In that case, it's Carnuba wax, I believe, and oil on a canvas material. It works REALLY well- ignores water like it wasn't there, and does the same for wind (I wore it once in Chicago, to give you an idea- no wind felt anywhere the coat covered.)
That said, I have also had some items in Gortex, and I would have to think that waxing Gortex would eliminate it's ability to breathe. Since this is the big selling point for Gortex, I don't think you'd want to do that.
How you waterproof depends a lot on WHAT you are waterproofing. Leather will need something different than nylon, and canvas something else again. Since you mention you're concerned about abrasion AND waterproof, I'd suggest you look at something like the cotton duck (which is a canvas weight, so it's canvas) work clothes like Carhart makes. I know a lot of guys who have used them, and I have myself, in the construction fields, for every type of job from mason to roofer. Canvas isn't water PROOF, more like water resistant, but the same places that sell these clothes also usually carry a good waterproofing spray, often on display right near the outdoor clothing.
I've never seen the need to waterproof my own, but being a plumber, I was usually working in out of the rain. I would think that a silicone spray on these would work well, but you could buy the same wax/oil mix they use on oilskin dusters for it, as these are just a heavier version of the canvas the dusters are made of.
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