How to Sand Concrete Surfaces for Smoothing & Finishing

Concrete is one of the toughest materials to work with, but sanding makes it possible to smooth rough patches, remove coatings, or prepare surfaces for sealing and painting. With the correct grit sequence and tools, you can achieve everything from a matte finish to a polished shine.

Why Sand Concrete?

Concrete surfaces often develop imperfections like bumps, stains, or leftover adhesives. Sanding levels the surface, removes old coatings, and opens the pores for sealers or stains. Without sanding, coatings may not adhere and the finish may look uneven.

Tools You’ll Need

• Angle grinder or floor sander with sanding discs
• Shop vacuum with HEPA filter
• Protective goggles, mask, and gloves
• Water source for wet sanding (optional)
• Silicon carbide sandpaper sheets or discs

Best Grit Sequence for Concrete Sanding

• 60 grit: Heavy material removal and leveling rough patches.
• 120 grit: General smoothing and coating removal.
• 220 grit: Refining surface before sealing or staining.
• 400 grit: Polishing for a smooth, matte finish.
• 800–3000 grit: Progressive polishing for a glossy, stone-like finish.

Step-by-Step: Sanding Concrete

1. Start coarse. Use 60 grit (25-pack) to level rough areas and remove coatings.
2. Smooth with 120 grit. Switch to 120 grit (50-pack) for general smoothing.
3. Refine with 220 grit. Use 220 grit (100-pack) to prepare for sealers or stains.
4. Polish with 400 grit. Light sanding creates a matte, even finish.
5. Finish with fine polishing. Progress through 800, 1500, and up to 3000 grit for a glossy, polished concrete look.
6. Clean thoroughly. Vacuum and rinse the surface before applying sealers or coatings.

Special Cases

For outdoor concrete, stop at 220 grit to keep the surface slightly textured for slip resistance. For countertops, progress through ultra-fine grits (2000–3000) for a smooth, decorative finish.

Pro Tips

• Always wear protective gear—concrete dust is hazardous.
• Wet sanding reduces dust and helps extend sandpaper life.
• Work in overlapping passes for consistent results.

Aftercare

• Seal sanded concrete to protect against stains and wear.
• Clean surfaces with pH-neutral cleaners.
• Store leftover sandpaper flat and dry.

FAQs

• Can I sand painted concrete? Yes—start with coarse grits to strip paint, then refine the surface.
• Is wet sanding better for concrete? Yes—it reduces dust and helps achieve a smoother finish.

Watch & Learn

Sanding concrete may be tough, but with the right tools and grits you can achieve professional results. Explore our stone & concrete sanding collection to get started.