Tip One: Use a Drywall Sander
If a previous spackling job left you with rough edges or an unblended texture, you can remedy this by using a drywall sander. A hand held sander is a grip-able applicator that you can set sand paper on for smoothing out surfaces. You will want to use 100-grit sandpaper to level out really rough, high-level spots and use 200-grit sandpaper (which has a more even, gentle distribution of grit) to smooth out the texture.
Tip Two: Fill in deteriorated spots
If you have any low or deteriorated spackling spots from your previous application, you will need to fill them in with a new application of spackling to maintain an even level with the areas you just sanded. To prevent a poor spackling job in this new application, apply a thinner coat and go over it with big, damp sponge to even it out.
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