Wet vs Dry Sanding: Which is Better for Resin Finishing?

Achieving a flawless finish on your resin creations is all about the right sanding technique. Choosing between wet and dry sanding makes a noticeable difference in both safety and results.

Why Wet Sanding is Preferred

Wet sanding is generally considered superior for resin surfaces. By using water as a lubricant, wet sanding helps keep resin cool, minimises airborne dust, and results in a much smoother surface. This makes it less likely to create heat that could mark or damage your workpiece, and cleaning up afterwards is far easier. For best results, use waterproof sandpaper and change the water often to clear away residue.

Step-by-Step Guide for Wet Sanding Resin

Start with a coarse grit (around 400) if your piece has imperfections, then gradually move up to finer grits (up to 2000 or more for a glossy shine).
Dip your sandpaper in water before use and keep the work surface wet throughout.
Sand in circular motions, applying gentle pressure to avoid scratches.
Keep rinsing both your piece and the sandpaper to prevent build-up.
Once satisfied, you can finish with a polishing compound for extra gloss.

For larger castings like tables, consider using a robust resin such as EpoxyTable 5-Five, which stands up to extensive finishing work.

When Does the Choice Matter?

If you are sanding intricate pieces, want to avoid dust in your workspace, or are aiming for a glass-like shine, wet sanding should be your go-to method. Dry sanding might still be useful for very quick removal of high spots, but it is less friendly for your lungs and harder to control for a smooth finish.

Related guides

Choosing wet sanding for your resin projects not only makes for a better finish but also an easier and safer process. For a deeper dive into finishing techniques, including filing and shaping, visit our main guide: How do you file resin?