How to Sand Epoxy Resin?

sand and polish epoxy resin

Epoxy resin has emerged as a versatile and indispensable material in the realm of crafting, woodworking, and DIY projects. Comprising of a combination of epoxy resin and a hardener, this compound offers exceptional durability, clarity, and versatility. From creating stunning artworks to crafting functional household items, epoxy resin has found its way into numerous applications, captivating the imagination of creators worldwide.

As fascinating as epoxy resin is, achieving a flawless finish with it requires meticulous attention to detail and proper technique. This is where sanding epoxy resin project comes into play as an essential step in the finishing process. Sanding not only smoothens rough surfaces but also eliminates imperfections, bubbles, and unevenness, paving the way for a professional-grade finish that accentuates the beauty of the epoxy resin project.

Materials and Tools

  • Sanding paper
  • Sanding block/pad
  • Sander (optional)
  • Spray bottle (for wet sanding)
  • Bucket of clean water (for wet sanding)
  • Denatured alcohol (for cleaning between grits)
  • Microfiber cloths
  • Drop cloths (to protect surrounding area)

Sanding Techniques

Getting ready:

Before you start sanding, make sure the epoxy resin is totally dry. This means you have to let it dry for as long as the manufacturer says. Also, fix any bumps or bubbles you see on the surface before you begin. You can fill them in with the right material and let them dry before you start sanding.

Dry Sanding:

Dry sanding is great for smoothing out the epoxy surface and fixing small bumps. Follow these steps carefully:

  • Start with the Right Grit: Look at how rough the epoxy is and pick the right sandpaper. Rough surfaces need rougher grit (like 80 or 120), while smoother ones need finer grit (like 220 or higher).
  • Sanding Technique: Move the sandpaper back and forth evenly over the surface, making sure to overlap each stroke. Don’t press too hard, or you might make the surface uneven or create dents.
  • Gradually Use Finer Grits: As you go along, switch to finer sandpaper to make the surface smoother. Always move from rough to fine grits in a proper order.
  • Keep it Clean: Dust from sanding can build up and mess with your work. Wipe the surface often with a clean cloth to keep it clear and see what you’re doing.

Even though dry sanding works well, it can make a lot of dust and might scratch the surface if you’re not careful.

Wet Sanding:

wet sand epoxy resin

Wet sanding is better for getting a smooth, shiny finish and cutting down on dust. Here’s what to do:

  • Making the Sanding Mix: Mix water with a bit of dish soap to make a slurry. This helps the sandpaper slide smoothly and stops it from getting stuck.
  • Keep Things Wet: Keep both the sandpaper and the surface you’re sanding wet while you work. Dip the sandpaper in the mix often to keep it wet.
  • Sanding Technique: Just like dry sanding, move the sandpaper back and forth with even pressure. Rinse the surface often to wash away any gunk and keep it clean.
  • Rinse Often: Wash the sandpaper and the surface you’re sanding regularly to stop dirt from building up and keep everything working right.

Wet sanding has a few perks, like making less dust and making your sandpaper last longer compared to dry sanding.

Sanding Curves and Corners:

When you’re sanding around curves, corners, and edges, it’s important to use special sanding sponges or finer sandpaper. These tools bend and flex better, letting you sand in detail without messing up the surface. Make sure to keep your sanding strokes steady and don’t press too hard, especially on delicate spots. If you take your time and pay attention to the little things, you’ll end up with smooth, even results, even in tricky spots.

Polishing Epoxy Resin

After you’ve finished sanding, polishing is the last step to make your epoxy resin project shine perfectly. Sanding makes the surface smooth and gets rid of any flaws, but polishing goes even deeper. It makes the surface clearer and gives it a shiny finish that really brings out the beauty of the resin.

There are different kinds of polishing stuff out there, each made for different jobs and finishes. For epoxy resin, you’ll find abrasive pastes, polishing powders, and liquid polishes. They come in different levels of roughness, from rough to smooth, so you can make your surface better step by step.

The polishing process typically involves using a polishing pad attached to a rotary tool or polishing machine. Here’s a brief outline of the steps involved:

  • Choosing the Right Polishing Stuff: Pick a polishing stuff that matches what you want your surface to look like. If you’ve got scratches or bumps, go for a rougher one. For a super shiny finish, use something smoother.
  • Putting on the Polishing Stuff: Squeeze a bit of polishing stuff onto the polishing pad. Make sure it’s spread out evenly on the pad.
  • Polishing Time: Turn on your rotary tool or polishing machine and gently press the pad onto the epoxy resin. Move it around in circles, making sure to cover the whole surface.
  • Step-by-Step Polishing: Start with the rougher polishing stuff to deal with any scratches or flaws. As you keep going, switch to smoother stuff to make the surface really shiny.
  • Final Buffing: After you’ve polished with the smoothest stuff, do one last buffing to get rid of any leftover bits and make it extra shiny. Grab a clean, dry cloth or polishing pad and buff the surface in circles. You’ll reveal the gorgeous shine of the epoxy resin.


By following the techniques outlined in this guide, you’ll unlock the secrets to achieving flawless finishes that elevate your creations to new heights. Remember, practice makes perfect, so don’t hesitate to experiment and refine your skills. With dedication and attention to detail, your epoxy resin projects will shine with professional craftsmanship, leaving a lasting impression on all who admire your work.

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