How to sand a wall is an important step before you prime & paint your walls. Sanding your walls should be done after you apply spray texture to your walls. You don't have to sand the walls too hard, just knock down the edges. You can also sand in between coats of drywall mud which will knock down any high edges so your next coat goes on nice & easy & not too thick. How do you sand a wall if you floated & skimmed the entire wall? You just sand the wall the same way but you should sand it with some extra pressure or sand a little more on your wall since you will have extra mud edges since you skimmed the entire wall. The key to sanding a wall, is to know how 'long' to sand the wall since you only want it smooth & you don't want to sand off all the mud you just carefully put on the wall.
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