Can Epoxy Resin Be Sanded?

Whether you're finishing a river table, sealing a bar top, or tackling your first DIY resin project, you've probably asked yourself: Can epoxy resin be sanded?

The short answer is yes. 

In fact, if you’ve worked with epoxy before, you know that sanding isn't just about removing imperfections; it can be a critical part of the build process. You’ll likely find yourself reaching for the sander for a few specific reasons:

• You’re adding a second or multiple coats of fresh resin.

• You’re removing surface imperfections like dust, dimples, or bubbles.

• You need to correct sharp or uneven edges.

• You prefer a matte finish instead of a glossy one.

However, sanding epoxy isn’t quite like working with wood or drywall. There’s a specific process you need to follow to avoid ruining your hard work. In this guide, we’ll break down the when, how, and why of sanding epoxy resin, and show you exactly how to bring back that glossy finish afterward.

Can epoxy be sanded after it cures?

Yes, once epoxy resin is fully cured, it can be sanded just like any other hard surface. In fact, sanding is necessary to level out imperfections, remove bubbles, or prep the surface for another coat. Just remember: epoxy is tough stuff—you’ll need the right grit and technique to get the job done cleanly.

How long does epoxy take to cure before it can be sanded?

Most epoxy resins need between 24–72 hours to fully cure before they can be safely sanded. The exact timing depends on the specific cure time for the brand you’re using and how much material you plan to remove.

If you sand too soon, you risk gumming up your sandpaper or damaging the resin surface. While a light scuff sand for recoating can usually be done around the 24-hour mark, deeper sanding—like removing a bubble below the surface—is best done once the resin is fully cured.

When in doubt, always refer to the manufacturer’s instructions for your specific epoxy. The surface should feel completely hard, with no tackiness, before sanding. You should be able to press your fingernail into an inconspicuous spot without leaving a mark. If it does leave a mark, it’s not fully cured and needs more time.

Industrial Clear is dry to the touch at 24 hours and fully cured at 7 days.

What type of sandpaper should I use to sand epoxy?

Start with a coarse grit sandpaper, like 80 grit, if you need to remove a larger amount of resin, such as leveling out bumps or high spots, or removing an imperfection below the surface. Then, gradually work your way up to finer grits (320, 600, or even 1000+) to smooth out scratches and prep for polishing.

If you’re going for a glossy finish, you have a couple of options: 

1. For that super high-gloss finish, simply measure, mix and pour a second coat of Industrial Clear. 

2. If you’re using a resin polishing compound to finish your piece, you’ll want to wet sand using high-grit sandpaper (800 and up). This helps reduce clogging and keeps the surface cool, preventing damage.

Do I need to sand cured epoxy before applying a second coat?

Yes, sanding cured resin is a must before applying a second coat. Once epoxy cures, it becomes slick and non-porous, which means the next layer won’t bond well unless you roughen the surface.

Use 80 grit sandpaper to give it a slight tooth, then clean up the sanding dust before pouring your next coat of epoxy/ polishing. 

Some useful tools for cleaning up sanding dust:

• A tack cloth: for wiping the surface clean 

• A paintbrush: for getting into textured areas

• A needle tool, a soft toothbrush or a can of compressed air: these help to remove sanding dust from cracks in wood or the open spaces left from any bubbles 

Can epoxy be sanded by hand or do I need a power tool?

You can sand epoxy by hand or use a power sander, depending on the size and detail of your project.

For small, intricate items (like resin jewelry or coasters), hand sanding gives you more control.

TIP: Try not to move the piece back and forth in the same position without rotating it or you will likely end up with an uneven edge. 

For large surfaces (like countertops or tables), a random orbital sander or finishing sander will save you time and muscle fatigue.

TIP: Let the sander do the work:  Hold it level, don’t lean on it, don’t hold it on an angle and don’t press down it because this will create uneven pressure.  Uneven pressure is what causes deep swirl marks, grooves, or other issues you'll need to fix later. 

It’s also important not to sand too long in one spot.  Friction creates hot spots which can soften the resin.

How to polish resin after sanding?

Once you’ve sanded up to a high grit (at least 1000), you can bring back that clear, glossy/matte finish by polishing. Here’s how:

1. Apply a plastic polish or buffing compound with a soft cloth or polishing pad.

2. Use a buffing wheel or drill attachment to work the surface until it shines.

3. Wipe off any residue with a clean microfiber cloth.

If you want a showroom high gloss finish, consider pouring a top coat of epoxy. Industrial Clear is cured and ready for sanding and a second coat after 24 hours, and provides a rock-hard, durable high-gloss finish to your projects.

So, can epoxy resin be sanded? Absolutely, and sometimes it should be. Whether you’re smoothing out a first coat or prepping for a matte finish, sanding is an essential step in the epoxy game. Just be patient, use the right grit, and always prioritize safety.

Industrial Clear - Rock Hard Epoxy Resin