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A healthy walk this weekend brought me to this topic. I went about 7 1/2 miles along a fairly non-bumpy trail, so i wore chacos instead of low hikers/boots. figured everything was going to get wet anyway, so i opted for footwear that wouldn't care.
before i went out, and because it's early season (not much chaco-wearing in the winter), i cut pieces of moleskin and put them on high-friction areas in advance. each side of the ball of each foot, 2 pieces at points along the ankle strap, one across the achilles.
moleskin, in case you haven't used it before, has a smooth/fuzzy outer face, a very light bit of cushion to it, and a very sticky backside to help prevent it from coming off when it gets rubbed. only one of the pieces i applied came off during my hike; it's important to apply moleskin to dry feet before you get out; putting it on when your feet are already damp/sweaty almost guarantees it will come off earlier than you would like. it helps to have a pair of bandage/utility scissors so you won't accidentally punch a hole in a backpack - they have a blunt/not pointy end.
i have had success with some kinds of clear surgical tape for the same purpose, but i think it tends to get pulled off easier.
i have not tried liquid bandage products, but they might be a good alternative if properly applied.
as it turned out, the moleskin worked...but i neglected one area, the pads of my toes. the water and friction from hiking left me with blisters under 4 of my toes. not sure if applying moleskin or alternative would have addressed that or not. normally, into the summer when my feet have toughened up a little, that wouldn't have been an issue.