Sanding plaster walls prepares them for painting by creating a smooth, even surface for better paint adhesion. The process involves a multi-step approach using different sandpaper grits.
Step-by-Step Guide to Sanding Plaster Walls
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Start with Medium Grit: Begin by lightly scuffing the entire wall using medium-grit sandpaper (around 60-80 grit, as suggested by Helpful Home DIY). This removes any imperfections and provides a base for the next step. This is crucial for removing any splashed plaster or grit/dust, ensuring a flawless finish (MyBuilder).
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Fine-tune with Finer Grit: Next, switch to finer-grit sandpaper (around 100-120 grit, as suggested by Helpful Home DIY). Repeat the process, sanding the entire wall to achieve a completely smooth surface. This step is essential for ensuring quality results (Pristine Painters NYC).
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Consider the Plaster Type: Note that newly applied plaster generally doesn't require sanding (DIYnot Forums). Sanding is primarily for smoothing imperfections in existing plaster walls. For severely damaged plaster, consider professional patching or skim coating before sanding.
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Tools and Techniques: You can use a sanding block, a piece of wood, or even an orbital sander for larger areas. Remember to always wear a dust mask to avoid inhaling plaster dust.
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Practice Makes Perfect: If you're unsure, practice on a scrap piece of drywall or plywood before tackling your walls (Reddit). This will help you get a feel for the process and avoid damaging your walls.
Alternatives to Sandpaper
Abrasive mesh made of silicon carbide is another option for sanding plaster (Expondo).
