did some more digging and found out that you should avoid any treatments with animal products on goretex lined boots. the natural oils start to clog/degrade the efficacy of the goretex membrane. so mink oil for me was a no-go.
A buddy of mine had some Danner's boot treatment, which is synthetic and works with gore-tex. Gave the boots a good clean with warm water, also recommended to open up the leather pores a bit, and then put on the sealer. will check out the nikwax as well for my own supplies.
so far, about 30km on the boots (including some easy flat ground break in), holding up great. had a full day in the rain and my feet were warm and dry the whole time. Also great support on the thick and nasty slopes, so i'm very happy with the model so far.
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