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Keeping liquids off the wall
On Earth, liquid flows downhill thanks to gravity. Creating an effective liquid fuel tank involves little more than putting a hole at the bottom of a container. That won't work in space, though. In microgravity, with no gravity to force liquids to the bottom of a container, they cling to its surfaces instead. The Slosh Coating investigation tests using a liquid-repellant coating inside a container to control the movement of liquids in microgravity. Ref. Source 3d.
I think this is not a good idea. Adding a repellant into water that can be used as drinking water or other things can not always be good. I think that having a substance that can expand some or collapse some would be better or introduce a atmosphere into a vessel that will help expel the water.