Sanding down cement requires the right tools and technique. Don't use regular sandpaper; it's too soft. Instead, utilize diamond sandpaper or concrete polishing pads for effective results.
Choosing the Right Tools
- Diamond sandpaper or polishing pads: These are specifically designed for the hardness of cement and provide superior sanding performance. The grit level should be selected based on the desired finish.
- Grinder (for larger areas): A grinder with heavy-duty sanding discs, especially for extensive areas, offers efficiency. A rubber pad is recommended for use with the grinder.
- Orbital sander (for smaller areas): For smaller projects, an orbital sander with appropriate sanding discs is a viable option.
Sanding Techniques
- Start with coarser grit: Begin with a coarser grit (e.g., 30-60 grit) to remove significant imperfections and level the surface.
- Progress to finer grits: Gradually switch to finer grits (e.g., 80-120 grit) for a smoother, more polished finish. This multi-step process ensures a superior result.
- Apply uniform pressure: Maintain consistent pressure throughout the sanding process to prevent uneven results.
- Use long strokes: Employ long, overlapping strokes for consistent coverage and to avoid excessive wear in one area.
- Vacuum frequently: Regularly clean the surface to remove dust and debris, ensuring better visibility and preventing clogging of the sanding tools.
Considerations for Different Scenarios
- Large areas: For significant areas, renting a concrete grinder is highly recommended for efficiency and speed. A strong vacuum is essential to manage the dust produced during this process.
- Smaller areas: For smaller areas, hand sanding with diamond sandpaper or using an orbital sander is perfectly acceptable.
The provided references confirm that regular sandpaper is unsuitable for sanding cement, emphasizing the use of diamond sandpaper or polishing pads. They also highlight the importance of starting with coarser grits and progressing to finer ones for optimal results. Several sources recommend using a grinder for larger areas, while others suggest using orbital sanders for smaller jobs. The use of a strong vacuum alongside the chosen tools is also emphasized across multiple resources.
