Take rubbing alcohol and apply it to a rag then rub the boots strongly. Try getting the leather a little wet, but not soaking. Wait until completely dry, then heat up boots with blow dryer, heat gun, stove top, oven etc... Then apply obenaufs. The heat melts it, allows it to soak in, and since you deglazed and removed some of the natural oils with the rubbing alcohol it will soak in well. This will darken the boots, may be splotchy at first but the more you apply the flatter the color and more protected your boots will be. This also insures dry feet!