3D Resin Glue: Complete 2026 Guide to Repairing and Joining Prints

Glue for 3D resin is any adhesive capable of permanently bonding UV resin printed parts, from cyanoacrylates to specialised epoxy resins. More than 40% of prints suffer some type of breakage during post-processing or use, according to resin manufacturers.

If you've landed here, you've probably got a decapitated miniature or that perfect piece that snapped when you removed it from the build plate 😅. Don't panic — with the right glue, your print will look as good as new (or even stronger).

In this guide I'm going to walk you through the three main types I use in my workshop: cyanoacrylate for quick bonds, two-part epoxy when you need brute strength, and UV resin for invisible repairs. You'll also find tips for preparing surfaces and avoiding those annoying white residue marks.

Which types of glue work best with 3D resin?

The best glues for 3D resin are cyanoacrylate (fast curing), two-part epoxy (maximum strength) and liquid UV resin (invisible bonds). Each type has its moment to shine, and choosing the wrong one can mean the difference between a perfect repair and a sticky disaster.

In my experience, the perfect universal glue doesn't exist. What works brilliantly for bonding a dragon's wings can be a disaster for gluing a tank wheel. That's why I've put together this table with the 8 types I use most, so you can choose wisely 🎯.

Note that acetone only works with ABS-like resins — if you try using it with standard resin, absolutely nothing will happen. For flexible resins, forget standard cyanoacrylate; it will become brittle and break on the first flex.

💡 Pro tip: Keep some leftover resin from your prints. Mixed with dust from the same sanded part, it creates a perfect filler paste for gaps before gluing.

How to repair broken 3D resin pieces step by step?

To repair 3D resin: clean with 99% isopropyl alcohol, sand the surfaces with 400-grit sandpaper, apply cyanoacrylate or epoxy glue, hold for 30-60 seconds and allow to cure completely. With this technique I've saved hundreds of pieces that seemed destined for the bin.

Surface preparation

Preparation is 80% of the success, trust me. First, clean both parts with 99% isopropyl alcohol (the 70% kind leaves residue). Rub thoroughly to remove uncured resin residue, finger grease and dust.

Then, lightly sand the contact areas with 400-600 grit sandpaper. Don't overdo it — you're just looking to create micro-roughness so the glue bonds better. If the piece is very small, a fine-grit nail file does the trick 💡.

Glue application

Apply glue sparingly. With cyanoacrylate, a pinhead-sized drop is usually enough. For epoxy, mix equal amounts and apply with a toothpick. Watch out! Less is more — excess only creates annoying flash.

If you use liquid UV resin, apply it with a syringe for greater precision. This method is my favourite for miniatures because you can reposition before curing with the lamp.

Clamping techniques

For small pieces, press firmly for 30-60 seconds with cyanoacrylate. With epoxy, use crocodile clips or masking tape to hold the position during curing (minimum 5 minutes).

Pro tip: Build a temporary support with putty or blu-tack. It lets you position complex pieces without them moving while the glue works its magic.

What is the best glue for each type of 3D printing resin?

Cyanoacrylate works great with standard resin, two-part epoxy with ABS-like, polyurethane adhesives with flexible resins and liquid UV resin with transparent ones. But watch out, every resin has its quirks and using the wrong glue is like trying to mix oil and water.

The secret lies in basic chemistry: some glues partially dissolve the surface creating a molecular bond, while others form adhesive bridges without altering the material. Flexible resins are the trickiest because their elasticity breaks rigid joints, and transparent ones lose clarity with glues that leave whitish residue.

For high-temperature resins, you need adhesives that can withstand over 80°C without softening. Structural epoxy is your best friend here. And if you work with biocompatible resins for dental or medical applications, make sure to use adhesives with appropriate certification.

💡 Pro tip: Before bonding, lightly sand the surfaces with 400-grit sandpaper and clean with isopropyl alcohol. Adhesion improves by up to 300% with prepared surfaces.

In the Mr Resin catalogue you'll find several post-processing products that perfectly complement these glues, from primers to varnishes that protect bonded joints.

How to achieve invisible repairs on miniatures and detailed models?

Invisible repairs require liquid UV resin applied with a needle, progressive sanding from grit 400 to 2000, and a final touch-up with primer and paint matching the original color. I've perfected this technique repairing Warhammer miniatures where every detail counts.

The trick lies in transparent liquid UV resin — it's like magic putty that only hardens when you want it to. Apply it with an insulin needle or sharpened toothpick, building up thin layers. To fill gaps, mix the resin with sanding dust from the piece itself (always save the residue when sanding) 🎯.

Progressive sanding is the key to success: start with grit 400 to level, move up to 800 to refine, then 1200 and finish with 2000 for a mirror finish. Between each grit, clean with alcohol to see the real progress. If you skip grits, the marks from coarse sanding will show through the paint.

💡 Pro tip: Cure the UV resin in 3-5 second intervals. Partial curing allows you to shape it with tools before the final hardening.

For the final touch-up, apply Vallejo Surface Primer with an airbrush or fine brush. Then, mix paints until you achieve the exact shade — always keep a piece of support handy for color testing. With patience, the repair will be completely invisible 🔥.

Frequently asked questions about glue for 3D resin

Can I use regular stationery glue on 3D prints?

No, stationery glue cannot withstand the structural stress of 3D printed parts and turns yellow over time. Always use cyanoacrylate or epoxy specifically designed for technical plastics to guarantee a long-lasting bond.

How long does epoxy glue take to dry on resin?

Two-part epoxy is dry to the touch in 5-10 minutes but needs 24 hours for full curing. If you're in a hurry, cyanoacrylate dries in 30 seconds, though with less structural strength.

Does cyanoacrylate damage the surface of cured resin?

Cyanoacrylate can leave white marks from the fumes, but it does not damage cured resin. Use low-fume cyanoacrylate or apply with a toothpick to avoid whitening around the bond.

How do you remove dried glue from a resin piece?

Acetone dissolves cyanoacrylate without damaging cured resin — apply it with a cotton swab and wait 2-3 minutes. For epoxy, you'll need heat (a hair dryer) and patience to soften it before scraping it off.

Is it safe to use acetone with 3D printing resins?

Yes, acetone is safe with cured resins, but use it with ventilation and gloves. Never use it with uncured liquid resin because the chemical reaction can be dangerous 🔥.

Conclusion:

Cyanoacrylate is your go-to for quick everyday repairs, two-part epoxy when you need structural strength, and liquid UV resin for those invisible bonds that seem like magic. After years of gluing broken pieces, these three types cover 99% of situations.

Always remember to work with adequate ventilation and gloves — your health comes first. With the right technique and the right glue, that piece you thought was lost will come back to life. And if you're looking for quality resins for your next prints, take a look at the Elegoo PLA-CF Carbon Fiber Filament we have at Mr Resin.

Don't let a broken piece stop your creativity, maker! 🤙