There are plenty of products that will condition the leather and keep the water out. Lots of them will also plug the pores in your goretex. If you have a boot with a goretex membrane you should make sure whichever product you use isn’t rendering it useless.
I use this on both my redwings and hanwags. My feet still breath and my boots keep the water out. The breathing is important on my redwings as it’s often 40-50 deg celcius where I work and if they didn’t breath my feet would rot from all the sweat.
