How to Sand Epoxy Countertops for a Mirror Finish (220–3000 Grit)

Epoxy countertops are durable, stylish, and popular in kitchens and bathrooms. But achieving that flawless, glossy surface requires careful sanding before polishing. This guide covers the grit sequence, tools, and pro techniques to sand epoxy countertops to perfection.

Why Sand Epoxy Countertops?

Even well-poured epoxy often has air bubbles, dust specks, or uneven texture. Sanding levels these imperfections, removes surface haze, and prepares the epoxy for polishing into a high-gloss, mirror-like finish.

Tools You’ll Need

• Random orbital sander with variable speed
• Sanding block for edges
• Spray bottle with clean water
• Microfiber cloths
• Wet/dry sandpaper sheets (220–3000 grit)
• Polishing compound & buffer

Recommended Grit Sequence

• 220 grit: Flatten uneven areas and remove dust bumps.
• 400 grit: Smooth sanding marks from coarse grits.
• 800 grit: Refines surface clarity.
• 1500 grit: Pre-polish smoothing.
• 2000–3000 grit: Ultra-fine finish for high-gloss polishing.

Step-by-Step Process

1. Inspect surface. Mark uneven spots or bubbles under bright light.
2. Start with 220 grit. Wet sand with 220 grit (50-pack) to level imperfections.
3. Refine with 400 grit. Continue wet sanding with 400 grit (10-pack) sheets to remove scratches.
4. Smooth with 800 grit. Work evenly across the surface for consistent clarity.
5. Pre-polish sanding. Use 1500 grit (25-pack) for silky smoothness before final grits.
6. Finish with 2000–3000 grit. Use ultra-fine sheets to prepare for buffing.
7. Polish to shine. Apply polishing compound with a buffer to achieve a mirror-like finish.

Special Cases

If epoxy has deep bubbles or ridges, start as low as 120 grit. For thin epoxy layers, avoid sanding too aggressively—use higher grits and polish instead.

Pro Tips

• Always wet sand to prevent clogging and overheating.
• Sand in overlapping passes for even results.
• Replace clogged paper frequently for consistent performance.
• Seal edges with painter’s tape to prevent rounding corners.

Aftercare

• Clean with mild soap and water—avoid abrasive cleaners.
• Use cutting boards to protect the finish.
• Reapply polish every few months to maintain shine.

FAQs

• Can I use a regular sander? Yes, but a variable-speed orbital sander gives the best control.
• Do I need to reseal after sanding? No—polishing restores gloss without resealing.
• What if my countertop looks cloudy? Continue sanding with finer grits until haze disappears, then polish again.

Watch & Learn

Epoxy countertops can shine like glass with the right sanding sequence. Stock up on medium sheets, fine grits, and ultra-fine sandpapers to get a professional finish at home.