It was the Redwing folks who sold me Obenhaufs... it has been good stuff for me, though I'll admit up front I'm not a one-legged sheep hunter in Alaska.
The guy told me to use it on boots with Goretex as it keeps the leather from drying out and cracking.It seems to have no effect on the Goretex.I do not think it actually makes the boot water proof.When I was a kid we used Bear grease to dress our hunting boots with.We would heat the boots up,rub it in then put a coat of Febrings on top of that.
Since boots have been lined with Goretex I have not had wet feet.