What Type of Sandpaper Do You Use on Epoxy Resin? A Complete Grit Guide
Sanding epoxy resin is a key step in achieving smooth edges, clear surfaces, and professional-quality results. But using the wrong type of sandpaper can leave deep scratches, cloudiness, or uneven finishes.
So what type of sandpaper should you actually use on epoxy resin?
The answer depends on grit size, sanding method, and project stage.
Best Sandpaper Types for Epoxy Resin
1. Waterproof Sandpaper (Recommended)
Waterproof sandpaper—often labeled as wet/dry sandpaper—is the best choice for epoxy resin projects.
Why it works best:
- Designed for wet sanding
- Reduces dust and heat buildup
- Prevents clogging with resin particles
- Produces a smoother, more controlled finish
For most resin artists, waterproof sandpaper is essential.
2. Silicon Carbide Sandpaper (Best Material)
Look for sandpaper made with silicon carbide abrasive.
Benefits of silicon carbide:
- Sharp, uniform cutting action
- Excellent for hard surfaces like epoxy
- Leaves finer scratch patterns
- Ideal for polishing and finishing stages
Most high-quality wet/dry sandpapers use silicon carbide.
Recommended Sandpaper Grit Progression for Epoxy Resin
Choosing the right grit order is just as important as the sandpaper type.
Typical Grit Sequence
- 400–600 grit – Remove surface imperfections, level edges
- 800–1000 grit – Smooth sanding marks
- 1500–2000 grit – Refine surface clarity
- 2500–3000 grit – Pre-polish finish
Skipping grit levels can leave visible scratches that are difficult to remove later.
When to Use Dry Sanding vs Wet Sanding
Dry Sanding
- Best for initial shaping or heavy imperfections
- Faster material removal
- Produces dust (wear a mask)
Wet Sanding (Preferred for Resin)
- Creates smoother finishes
- Keeps the surface cool
- Prevents sandpaper clogging
- Reduces airborne dust
Most resin artists use dry sanding first, then switch to wet sanding for finishing.
How to Tell If You’re Using the Wrong Sandpaper
Signs your sandpaper isn’t suitable:
- Deep scratches that won’t disappear
- Cloudy surface even after polishing
- Sandpaper clogs quickly
- Resin surface overheats
Switching to finer grits or waterproof sandpaper usually fixes these issues.
Tips for Best Sanding Results
- Always sand fully cured resin (24–72 hours)
- Rinse sandpaper frequently during wet sanding
- Sand evenly using light pressure
- Wipe the surface clean between grit changes
Consistency matters more than force.
Final Thoughts
Using the correct sandpaper on epoxy resin makes a dramatic difference in the final result.
Waterproof, silicon carbide sandpaper combined with a proper grit progression ensures smooth surfaces, better clarity, and professional-quality finishes.
Whether you’re sanding dried flower resin art, jewelry, or decorative pieces, the right sandpaper is the foundation of a flawless epoxy project.