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Cutting & Assembly

Plastic glue not working on resin or metal

Plastic cement works by melting styrene together. On resin and metal there is nothing to melt, so the joint just sits there and falls apart.

Quick answer

Plastic (solvent) cement only bonds styrene by softening and fusing it, so it does not work on cured resin or metal. Use cyanoacrylate (CA) glue or two-part epoxy instead. Wash resin with warm soapy water first to remove mold release, scuff both faces lightly, dry-fit, and pin heavier or load-bearing joints with a metal rod so the glue is not the only thing holding the part.

  • TimeRescue: 15-30 minutes plus glue set time. Prevention: wash and scuff at the start.
  • DifficultyBeginner

Safety first

  • CA glue bonds skin in seconds and its fumes irritate eyes and airways; ventilate.
  • Never use CA accelerator on cotton or tissue, which can heat rapidly.
  • Wear eye protection when drilling.
  • Resin dust from sanding is irritating; wear a mask and sand outdoors or wet.

Is this your problem?

  • Glue never grips and the surfaces are shiny or slickMold release or oil is still on the surface: wash and scuff, then re-glue. This page.
  • The joint is white, frosted or crusty around the seamSee Super glue white residue.
  • A resin print (not cast resin) will not hold glue or stays tackySee Sticky resin print.
  • The part fits badly and the gap forces it apartSee Warped plastic or resin parts.
  • A styrene kit joint came apartLikely too little cement or painted surfaces; scrape paint from the faces and re-bond, or pin it.

You'll see

A joint that looks fine but pops off with a light touch, a resin part that never seems to grip, or a metal limb that spins or slides away from its body even after glue has set. Often the glue stays tacky or leaves a smooth film on the surface.

Likely causes

  • Wrong glue typePlastic cement relies on dissolving styrene. Cured resin and metal do not dissolve, so the glue has no surface to fuse.
  • Mold release on resinCast resin parts often carry a release agent that stops glue from gripping until it is washed off.
  • Smooth, glossy facesGlue grips better on a very lightly roughened surface than on a polished one.
  • Tiny contact areaHeads, hands and limbs on metal or resin figures often join on a small area that can not carry much load.
  • Joint under stressHeavy metal parts apply leverage on the glue line, which can peel the bond.

What you need

  • CA glue (thin or gel) and optionally an accelerator
  • Two-part epoxy or epoxy putty for filling
  • Warm water, mild dish soap and an old toothbrush
  • Fine sandpaper or sanding stick
  • Pin vise and brass rod for pinning
  • Clamps or tweezers to hold the joint

How to fix it

  1. Wash resin parts in warm water with a little dish soap and scrub gently with a soft toothbrush. Rinse and dry fully.
  2. Check for flash and burrs on both faces and clean them; a joint that does not seat will not hold.
  3. Scuff both glue faces very lightly with fine sandpaper so they are matte, not shiny. Wipe off dust.
  4. Dry-fit the parts. If gaps remain, plan to fill them rather than depend on the glue to bridge them.
  5. For load-bearing joints (heads, arms, bases), drill matching holes and pin with a short metal rod. Test the pin dry.
  6. Apply a very small amount of CA glue or epoxy. Align, hold or clamp and let it cure; epoxy needs longer than CA, so follow the maker's instructions.
  7. Fill any remaining gaps with epoxy putty or gap-filling CA, then sand once cured.

What to avoid

  • Slathering plastic cement and hoping it takes hold.
  • Gluing painted faces without scraping paint away.
  • Using thin CA to bridge a visible gap.

Common wrong fixes

  • Adding more and more glue, which makes a mess and does not give you a better bond.
  • Holding a joint with your fingers for long periods rather than clamping it.

Not worth fixing, or time to ask us

If you are working with a very heavy metal piece, a rare resin figure or a mixed-material kit, ask us before gluing. We can suggest a pinning and adhesive plan for that case.

Send us a photo

By situation or hobby

Cast resin kits

Wash first; mold release is the most common reason resin glue joints fail.

Metal (white metal, pewter, brass) miniatures

Scuff the faces, use CA or epoxy, and pin large parts. Some soft metals bend; support them while the glue sets.

Resin to plastic

Use CA or epoxy. Plastic cement may bond the styrene side but will not grip the resin.

Gaps at the joint

Slow-setting epoxy putty fills better than thin CA, which wicks into the gap and may not bridge it.

Already ruined?

A failed joint can almost always be redone. Break it apart cleanly, remove old glue from both faces with a blade or file, wash again and re-bond with the correct glue plus a pin. If glue has soaked into porous resin or whitened a visible surface, sand it back and repaint the area.

Next time

  • Wash resin and metal parts before assembly.
  • Use CA or epoxy, not plastic cement, for resin and metal.
  • Dry-fit first and fix gaps before gluing.
  • Pin any joint that carries weight.
  • Keep glue amounts small.

Frequently asked questions

Can you use plastic cement on resin?

No. Plastic cement only dissolves and fuses styrene, so it does not hold cured resin or metal.

What glue works on resin miniatures?

CA glue and two-part epoxy are the usual choices, after washing off mold release and lightly scuffing the surfaces.

What glue works on metal miniatures?

CA glue or epoxy. Pin large or heavy parts with a rod because the glue line alone may not hold the weight.

Is super glue strong enough for resin?

For small light joints, yes. For heads, arms or weight-bearing parts, add a pin.

Why does my CA glue not set on resin?

Some resins are slightly oily or have release on the surface, which slows or weakens the bond. Wash with soap and water first.

Jargon explained
Mold release
A slippery agent on cast resin parts that stops glue and paint from gripping until it is washed off.
Pinning
Joining parts by drilling holes and gluing a rod across the join.
Plastic cement
A solvent glue that bonds styrene by softening it; it does not work on resin or metal.

Tools that can help

  • 502 Super Glue for Scale Models from 1,500 kr

    Why it helps: A fast 502 cyanoacrylate that bonds plastic, metal, resin and wood.

    How to use it

    Glue small resin and metal parts after washing and scuffing the faces.

  • UStar Precision Pin Vise Drill Set 5,500 kr

    Why it helps: A hand drill with ten bits from 0.4 mm to 1.3 mm, described for pinning parts and for plastic, resin and soft metal.

    How to use it

    Drill matching holes for pins in joints that carry weight.

  • AB Epoxy Putty for Scale Modeling 2,400 kr

    Why it helps: A two-part epoxy putty for filling seams and repairing broken parts, in quick and slow-dry versions.

    How to use it

    Fill gaps at resin and metal joints after the bond has set.

  • 2/4/20pcs Galaxy Model Clamps from 1,700 kr

    Why it helps: Clamps for holding model parts together while glue sets; they open up to 60 degrees.

    How to use it

    Hold joints still while the glue cures.

Reviewed November 3, 2026

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