I am brutal on my hunting boots and usually wear them nearly year round for different things. My preference is for all leather with a Goretex bootie. I have tried most boot dressings including waxes, mink oil and silicone types. While I love the way mink softens the leather, I have found that it will also tend to dry out the leather as it evaporates, necessitating doing it often. Silicon works well, but doesn't penetrate as well as mink.
So that leaves me with wax dressings. My favorite is Sno-Seal. Heat your boot with a hair dryer, apply a liberal amount of Sno-Seal and melt it in with the hair dryer. Let the boot cool for 10-15 minutes (or while doing the other boot) and repeat. After the second application, I will let it cool and then apply another thin coat to the boot without melting it in. Let that sit for a couple hours and rub off what remains on the outside. It softens the leather nicely and keeps the leather from absorbing water. Additionally, my experience is that it last longer than either mink or silicone, and won't dry out the leather. (You can also use this method for mink and silicone)
Good luck.
(EDIT: The reason for sealing a GoreTex boot is not specifically for waterproofing. Your feet will get colder if the leather is soaked, even if the GoreTex keeps your foot dry. Also, when hunting in snow, the wet leather will freeze if your boots are insulated and then you get REALLY cold feet. :shocked:

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[ 10-13-2003, 02:12 PM: Message edited by: Lured In ]