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Yes, you can and should sand latex if you are painting over it. You cannot expect the next coat of paint to grip if it doesn't have a roughed surface to grip to. Painting a glossy or glazed surface is like painting glass - it has no adhesion and will lift right up. Fresh latex is hard to sand because it hasn't cured yet. You have to wait it out. If it ...


TSP and a sponge mop. Wash the walls once with a TSP solution, then again with clean water to remove any soapy residue. This stuff really works, so that means if you've sensitive skin, wear those big rubber cleaning gloves.


Using a Dyson, vacuum the wall.

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