What Grit Sandpaper to Use for Walls: Guide to Smooth Finishes

Achieving a flawless wall finish starts with the right sandpaper—choosing the correct grit is essential for smoothing imperfections and ensuring paint adheres perfectly.

Grit size determines sandpaper coarseness, with lower numbers (60–120) ideal for heavy sanding and surface prep, while medium grits (150–180) smooth out scratches. For walls, 120-grit works well for rough patches; 180–220 removes paint marks cleanly without damaging drywall. Avoid fine grits unless refining an already smooth surface.

Before painting, gently sand walls with 120-grit to eliminate bumps and smooth minor flaws. Use circular motions for even results, then wipe away dust with a damp cloth. For painted surfaces needing repair, 150-grit ensures the new paint bonds securely, preventing peeling or cracking over time.

Different wall materials respond differently: plaster walls need 120–150 grit to avoid dents, while textured drywall benefits from 180 grit for consistent smoothing. If fixing scratches or old paint, start with 120 grit to level the area, then progress to finer grits for a flawless finish that enhances your paint’s longevity.

Selecting the right grit sandpaper for walls is key to professional results. Start with 120 grit for surface prep, then refine with higher grits as needed. With the correct sanding technique, your walls will be smooth, ready for paint, and built to last—perfect for any home improvement project.