Step 2: Prepare the surface
Lightly sand the wall area around the crack using 120-grit sandpaper. This will roughen the surface and make it easier for the compound to adhere. Wipe the crack and wall area with a wet sponge. Keeping the surface damp will help prevent the joint compound from drying out and cracking.
 Wet the surface of the wall with a sponge to keep the compound from drying and cracking.
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