How to Sand and Polish Cured Epoxy Resin

How to Sand and Polish Cured Epoxy Resin

Sanding and polishing epoxy resin is essential for achieving a professional, glass-like finish. Here are the steps and tips to do it effectively:

Allow Full Cure: Ensure the resin has fully cured (typically 7 days) before sanding or polishing.

Wet Sanding Technique:

• Start with coarse grit (e.g. 400 grit) and gradually work up to finer grits (600, 800, 1000, 1500, 2000).

• Use water to lubricate the sanding process—this reduces heat and removes debris.

• Sand in circular motions and rinse between grits.

Polishing:

• Use a polishing compound specifically designed for plastics or resins.

• Apply with a microfiber cloth or a buffing pad using a rotary tool or polishing machine.

• Finish with a clean cloth to remove any residue and enhance the shine.

Tips:

• Always sand on a flat surface to avoid uneven pressure.

• For deep scratches, start with lower grit (e.g. 240–320).

• Avoid waxes or coatings not designed for epoxy, as they can yellow over time.