Any kind of wax or grease or silicone spray will reduce goretex breathability, so not great for new Goretex type products.
But put onto old leaky Goretex these products can make it waterproof again, but with loss of breathability. I'd go for waterproof any day, and once the boots are waterproof you can keep the moisture away from the insulating sock and boot lining with a vapour barrier system.
Bread bags do OK.
In my experience wax products are crap at softening leather. Dubbin is better for that and as long as things are dry less heating tricks are required because it's already half melted.
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