Learn the Craft · Standard Guide
Sanding & Polishing Cured Resin
Quick answer
Sand cured resin using progressively finer wet/dry sandpaper — starting around 400 grit for imperfections and working up to 3000 grit — always wet to reduce dust and heat, then finish with a polishing compound for a mirror-like shine. Skipping grit steps leaves visible scratch marks the next grit can't fully remove.
Based on hands-on resin work by practising Indian artists across humid coastal and drier inland studios.
Step-by-Step Sanding Process
- Start with 400-600 grit wet/dry sandpaper to remove visible imperfections or level a rough surface
- Progress through 800, 1200, 1500, and 2000 grit, each removing the scratch pattern of the previous grit
- Keep the surface wet throughout — this reduces heat buildup and controls dust
- Finish with a plastic/acrylic polishing compound and a soft cloth or buffing pad for shine
Wear a simple dust mask even for wet sanding
Cured resin is chemically inert, but fine sanding dust is still a respiratory irritant like any sanding dust — basic precaution is still worthwhile.
When Sanding Is Necessary
- Fixing a rough or uneven demoulded edge
- Correcting minor surface defects before selling a piece
- Preparing a surface for an additional resin layer to bond well
Tools You'll Need
| Item | Approx. cost |
|---|---|
| Wet/dry sandpaper assortment (400-3000 grit) | ₹150-₹400 |
| Plastic polishing compound | ₹200-₹500 |
| Microfiber buffing cloth | ₹50-₹150 |
Frequently Asked Questions
Do I need an electric sander for resin, or is hand-sanding enough?+
Hand-sanding works well for small to medium pieces and gives more control; an electric random-orbital sander speeds up larger, flat surfaces like tabletops but isn't necessary for jewellery-scale work.
Why does my resin look scratched after sanding instead of smoother?+
This usually means you skipped a grit step or didn't fully remove the scratch pattern from the previous grit before moving to a finer one — go back one step and ensure even coverage before progressing.
Can I skip sanding entirely if my pour is already smooth?+
Yes, a well-executed pour with proper bubble removal often needs no sanding at all — sanding is a corrective step, not a mandatory part of every project.
Is wet sanding necessary, or can I sand resin dry?+
Wet sanding is strongly recommended — it reduces both airborne dust and heat buildup from friction, which dry sanding can cause, sometimes leading to surface stress marks.
How do I polish resin without power tools?+
A soft microfiber cloth with a small amount of plastic polishing compound, applied with firm circular hand motions, works well for smaller pieces without needing a buffing wheel.