Put the moleskin on Before you blister. It will prevent blisters and is easy to replace on a daily basis if needed.
Moleskin is very bulky. It will be uncomfortable if your boots fit snug. Since it is adhesive, it can and will come loose after a few miles especially if you sweat in your boots. Believe me, shear nylon stockings or socks are a much better blister preventer.
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