How to Sand and Polish Resin to Perfection


Resin is a versatile and captivating material that allows artists to create stunning and glossy finishes. However, achieving a smooth and polished surface requires proper sanding and polishing techniques when the resin is dull or scratched. In this blog post, we will provide you with a comprehensive guide on how to sand and polish resin, allowing you to take your resin projects to the next level. 

Gather Your Supplies

Before diving into the sanding and polishing process, ensure you have the necessary supplies at hand:

  • Resin piece to be sanded and polished
  • Sandpaper (various grits, ranging from coarse to fine)
  • Sanding block or sponge
  • Water
  • Microfiber cloth or soft cloth
  • Polishing compound
  • Polishing pad or cloth
  • Protective gear (safety goggles, mask, gloves)

Safety Precautions

During the sanding and polishing process, it's crucial to prioritize safety. Wear protective gear, including safety goggles, a mask to avoid inhaling particles, and gloves to protect your hands.


Sanding the Resin

Start with Coarse Grit

Begin the sanding process with coarse grit sandpaper (around 120-220 grit) to remove any visible imperfections, such as bumps or rough edges. Use a sanding block or sponge to ensure even pressure and maintain control.

Gradually Move to Finer Grits:

Progressively move to finer grit sandpapers (400-800 grit) to smoothen the surface further. This helps to eliminate scratches left by the coarse grit sandpaper. Remember to sand in a circular or back-and-forth motion to achieve an even finish.

Wet Sanding Technique

For an exceptionally smooth surface, switch to wet sanding. Wet the sandpaper and the resin surface with water to reduce friction and prevent clogging. Wet sanding also helps to minimize dust and keeps the resin cool during the process.

Gradation of Grits

Continue sanding with increasingly finer grits (1000-3000 grit) until the desired level of smoothness is achieved. Each successive grit will refine the surface, removing the scratches left by the previous grit.


Polishing the Resin

Cleaning the Surface

Thoroughly clean the sanded resin piece using water and a mild soap. This removes any sanding residue and prepares the surface for polishing.

Applying Polishing Compound

Apply a small amount of polishing compound to a clean, soft cloth or polishing pad. Gently rub the compound onto the resin surface in circular motions. The compound helps to remove any remaining scratches and brings out the resin's natural luster.

Polishing Technique

Using moderate pressure, continue to polish the resin surface until it achieves the desired level of shine. Maintain a consistent motion and periodically check the progress to ensure you don't over-polish in one area.

Final Touches

Once satisfied with the level of shine, wipe off any excess polishing compound with a microfiber cloth or a soft cloth. Inspect the resin piece under different lighting conditions to ensure an even and flawless finish.




Mastering the art of sanding and polishing resin is essential for achieving a flawless and professional finish in your resin projects. By following the step-by-step guide outlined above, you'll be able to transform rough resin surfaces into glossy masterpieces. Remember to practice patience and precision throughout the process, and don't hesitate to experiment with different techniques and materials. Enjoy the journey of creating beautifully polished resin creations!

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