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Sanding
After you have skimmed the wall, let it dry. Normally an overnight period
will do but if it is humid, it may take longer. It will definitely take longer
if you have a lot of deep nail holes to fill or put the skim coat on too
thick.
After the skim coat has dried, it is time to sand.
You can use the sander pictured at left and achieve good, if dusty, results.
You should use a fine sand paper and remove just enough mud to smooth the coat.
If you sand through the skim coat it isn't the end of the world, just make
sure it doesn't leave lines. An alternative to the hand sander is an electric
sander that is hooked up to a shop vac. When I skimmed a wall that had a stucco
finish this method worked wonders.
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