As part of a first aid kit, I sometimes carry a tiny aerosol container of liquid bandage. After cleaning a wound, spray on a thin layer or two of liquid bandage. The resulting film is flexible, breathable, impervious to dirt, and easy to reapply.
In India, I witnessed someone cover a large, festering leg wound with liquid bandage. Within a couple of days the wound showed no signs of infection, and had shrunk to almost nothing.