Quick answer: Yes, you can sand glass. Use silicon carbide – wet/dry sheets, discs or belts – because it's the sharpest grain and cuts glass without loading. Dry sand first with coarse grit if you need to remove material or reshape an edge, then wet sand through finer grits with water to remove scratches and bring up a smooth, clear finish. Always wear gloves and eye protection.
Safety first
Sanded glass throws fine, sharp particles, so wear gloves and eye or face protection every time. Clamp the piece so it can't slip from your hand, but don't over-tighten – too much pressure can crack or shatter it. Different glass and different jobs call for different techniques and abrasives, which is what the rest of this guide covers.
Which abrasive to use on glass
Silicon carbide is the best grain for glass because it's the sharpest and most friable: it cuts fast, leaves a clean scratch pattern, and fractures into fresh edges as it works. It comes in three forms:
- Silicon carbide discs on an angle grinder or disc sander for heavy work and shaping. Use a light hand and light pressure, wet the disc, and work in circular movements. See our glass fabrication discs.
- Wet/dry sandpaper sheets for hand sanding. They're waterproof and heat-resistant, and we recommend using them with water or a sanding solution so the glass doesn't overheat.
- Waterproof silicon carbide belts on a belt sander for edges and larger pieces. A belt is far faster than a sheet for seaming and shaping. Our S181 glass fabrication belts run wet or dry.
Whatever the form, use waterproof abrasive if you're wet sanding. Regular paper falls apart in water and leaves grit behind.
Grit sequence
| Step | Grit | Purpose |
|---|---|---|
| Shaping and seaming | 60–80 | Remove material, knock down a cut edge (dry) |
| Smoothing | 120–220 | Remove the coarse scratches (dry or wet) |
| Refining | 320–400 | Fine scratch pattern before polish (wet) |
| Finishing | 600–1500+ | Near-clear finish; follow with cerium oxide to polish (wet) |
Dry sanding vs. wet sanding glass
Start dry if you need to remove stock or reshape an edge – dry sanding levels the surface faster. If you only need to smooth or remove scratches, you can go straight to wet sanding. The two leave different results: dry sanding evens the surface but leaves minor scratches; wet sanding removes those scratches, cuts dust to almost nothing, and gives you the even, near-mirror finish. A simple rule for motion: dry sand in small circles to level, wet sand in straight, linear strokes as if you were painting.
