After the last coat of compound has dried, sand over the entire surface with a hand-sander.
Use about 120 grit sandpaper or sanding screen.
Do not sand down to the joint tape or you will have to skim the area with compound again. sand joint compound

Dust off the wall and prime over the patch, or the entire wall using a quality wallboard primer. When the primer has dried dry sand any rough areas with 120 or finer paper, check for any imperfections you may want to fill, if you apply any more joint compound it should be primed before it is painted. The wall is ready for finish paint.prime compound

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