How Do You Sand a Wall?
Sanding walls is crucial for achieving a smooth, even surface before painting, especially on previously painted walls or drywall repairs. The process involves using sandpaper or a sanding block to remove imperfections and improve paint adhesion.
The type of sandpaper you need depends on the wall's condition and the type of previous paint.
- Previously painted water-based paint: Use fine-grit sandpaper.
- Previously painted oil-based paint: Use medium-grit sandpaper (100- to 150-grit).
- Drywall repairs: Sand as much as necessary to achieve a smooth finish. The amount of sanding needed depends on your skill level; better knife skills during spackling reduce sanding time.
For efficient sanding, consider using a sanding sponge, a pole sander, or a shop vac sanding system. A sanding sponge with 100-grit sandpaper is a good option.
Sanding Techniques
- Dull uneven surfaces: Gently rub the sandpaper or sanding block over the wall to smooth out any bumps or imperfections.
- Remove dust: After sanding, wipe the walls with a damp cloth to remove all sanding dust. Allow walls to dry thoroughly before painting.
Remember, sanding walls isn't always necessary. Many sources suggest that for repainting, sanding may not be required, particularly if the existing paint is in good condition. However, sanding is beneficial for improving paint adhesion and achieving a smoother, more professional finish. Contractors often sand walls before repainting, regardless of the previous condition.
Tools for Sanding Walls
- Sandpaper: Various grits (fine, medium) are needed depending on the surface and the amount of smoothing needed.
- Sanding block: Provides even pressure for smoother sanding.
- Sanding sponge: Convenient for smaller areas and contours.
- Pole sander: Increases efficiency for large walls.
- Shop vac sanding system: Minimizes dust, particularly useful for repainted walls prone to trapped roller nap.
