Do I Really Need to Sand Resin Before Polishing?

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Sanding is an essential first step in achieving a flawless, high-gloss finish on clear resin. Skipping this stage often leads to frustrating results, with surface imperfections lingering beneath the polish.

Why Sanding Prepares Your Resin for Polishing

Sanding removes unevenness, micro-scratches, and marks left from casting or curing. Even if your resin looks smooth, tiny imperfections can scatter light, preventing a clear, glossy finish. By starting with a high-grit abrasive and working up to finer grits, the surface is gradually levelled and smoothed, leaving it ready for polishing compounds.

Getting the Best Results: Step-by-Step

• Start with Sandpaper: Begin sanding with a coarse grit if there are visible bumps, then progress through finer grits to at least 1000–1500 grit for clear resin.
• Keep It Wet: Wet sanding helps avoid heat build-up and reduces scratching.
• Polishing Compound: Once sanding is complete, apply a specialist product such as Epoxy Polish using a polishing pad or suitable machine for best performance.
• Final Buff: For the ultimate shine, finish with a microfibre cloth or buffing sponge.

When Skipping Sanding Causes Problems

If you try to polish unsanded resin, polishing compounds rarely fix deeper flaws, and surfaces may remain cloudy. Proper sanding ensures the polish can do its job—delivering clarity, gloss, and a professional finish every time.

Related products

• "Epoxy Polish" – Epoxy Resin Polishing System
• 1200W Polisher for Sanding and Buffing – Variable Speed, D-Handle
• "Carbon Polish" – Polishing System for Dark and Black Surfaces, 250ml

Related guides

• How Do You Polish Clear Resin

Taking the time to sand your resin before polishing makes all the difference in your finished piece. For more expert advice on achieving a brilliant clear resin finish, explore our full guide on how to polish clear resin.