What Glue Should You Use? A Guide to Bonding 3D Prints and Common Materials

Choose an adhesive by checking what each material is, how well the joint fits, and how the finished piece will be used. Wood-to-wood, PLA-to-PLA and plastic-to-metal joints call for different considerations. A joint that needs to flex also needs a different approach from a rigid one.

For small, close-fitting rigid 3D-printed parts, cyanoacrylate (CA) glue may be worth testing. If there is a gap or you need more time to align the parts, consider a suitable two-part epoxy. For PE, PP, soft plastics or foam, look for a formula that explicitly lists that material. Check the product's compatible materials and limitations rather than relying on the words “all-purpose”.

What glue should you use for different materials? A quick guide

Use the table as a starting point. Each reference supports only the named product or stated use; it does not establish that every adhesive of the same type is suitable. Test on a sample of the same material or on an inconspicuous area before using it on the finished piece.

Materials to bond	Adhesive to consider	Suitable joint or use	Limitations and what to check
Wood + wood	PVA wood glue	Close-fitting wooden joints that can be clamped	A standard wood glue will not bridge large gaps; Gorilla Wood Glue specifically says it is not intended for gap filling.
Paper or card + paper or card	Craft glue specifically suitable for paper	Lightweight, flat craft projects	Test for seep-through or changes to the surface; UHU All Purpose Adhesive Solvent Free lists paper and card among its uses.
Fabric + fabric	Fabric glue that remains flexible after curing	Fabric joints that need to bend	Check the fabric, washing instructions and use limitations; Loctite Vinyl, Fabric & Plastic Repair is one specific formula.
PLA + PLA / PETG + PETG	Cyanoacrylate (CA) super glue	Small rigid parts with close-fitting joints	Test the actual filament and formula; Prusa's assembly guide covers these printing materials.
ABS / ASA + the same printed material	CA, or a solvent-based adhesive explicitly compatible with that material	Close-fitting joints	Do not treat every modelling cement as suitable for ABS or ASA; Prusa's guide also notes that formulas differ.
Fully post-cured rigid resin prints + similar parts	CA or a suitable two-part epoxy	Quick positioning of small parts; assembly across a larger area	Follow the resin's post-processing requirements; Formlabs' assembly guide compares these approaches.
Rigid printed plastic + metal or glass	Epoxy explicitly compatible with both materials	A sufficiently large joint area or a small gap to fill	“Multiple hard plastics” does not mean the formula has been verified for your PLA or PETG; the Loctite epoxy technical sheet lists compatible and excluded materials.
Expanded polystyrene (EPS) + wood or paper	Adhesive labelled as suitable for EPS	Lightweight foam projects	Identify the foam first; the UHU POR technical sheet lists EPS uses and excludes materials such as PE and PP.
PE / PP plastic + plastic	A dedicated primer/activator system used with its specified adhesive	Plastic joints explicitly supported by the product	Ordinary adhesives may not work; Loctite Plastics Bonding System includes an activator and a specified CA glue.

The same pair of materials may call for different solutions depending on the joint. A small joint on a display model is not loaded like a hook that is twisted repeatedly. If a part needs to come apart for reuse, consider designing in screws, clips or magnets. Formlabs' guide to designing joints also discusses mechanical connections for functional parts.

What glue should you use for 3D-printed parts?

This section is about bonding parts after printing. Adhesive applied to a build plate to improve adhesion or help with release should be chosen according to the build plate and filament guidance; it is not automatically suitable for assembling printed parts.

PLA and PETG: start with the joint, not just the material name

For a small, rigid part with a close-fitting joint, CA super glue is one option to test. If there is a gap, first improve the fit, then consider a compatible gap-filling adhesive; do not try to fill a large gap with a lot of thin CA glue. Pigments, fillers and surface coatings in the filament are also worth checking in your test.

ABS and ASA: match solvent-based adhesives to the actual material

CA is one option to investigate. Solvent-based adhesives work by acting on the material's surface, so the wrong formula—or a spill on a visible face—may damage the part. Consider this route only after checking that the product names the exact material and testing it on a sample. Do not experiment with solvents on unidentified plastics. See Prusa's guide to bonding printed parts for further context.

Resin prints: wash, dry and post-cure first

Complete post-processing as directed by the resin manufacturer before testing a joint. CA may be worth testing on small rigid parts; for a larger joint area, consider an epoxy with enough working time. Flexible resins need a separate check of their formula and requirements—do not assume that advice for rigid resin also applies to them. Formlabs' assembly guide compares approaches for different joint sizes.

TPU and TPE: the joint needs to move with the part

Check that the adhesive explicitly supports the actual flexible material and that the cured joint can handle the required bending. Prusa mentions CA for some firmer joint areas, but that does not mean it is suitable for every TPU. If the part flexes repeatedly, test the joint first. A standard rigid epoxy may also be unsuitable; for example, the Loctite formula in the table explicitly excludes flexible materials.

What is the difference between 502 glue, AB glue, hot glue and other adhesives?

502 / super glue: convenient for positioning small joints

“502” generally refers to cyanoacrylate super glue, but products vary in thickness, compatible materials and flexibility. Check the actual formula. On clear parts or dark surfaces, consider the risk of white bloom. Avoid skin contact and provide ventilation as directed on the label. Loctite's guide to super glue also warns against using ordinary super glue on cotton or wool.

AB glue: check which two-part adhesive it is

“AB” indicates two components; it does not mean that every product uses the same chemistry. Common two-part epoxy adhesives combine resin and hardener in a specified ratio. Some formulas can fill small gaps, but you still need to check the materials, bond-line thickness and conditions of use.

For example, the Loctite Epoxy Clear Multi-Purpose technical sheet lists metal, glass, wood and several rigid plastics, but does not recommend the product for PE, PP or flexible materials. Knowing that a product is called “AB glue” is not enough to tell whether it suits your project.

Hot-melt glue: consider the material, temperature and bond-line thickness

Hot-melt glue is applied with heat. Check which materials the glue stick supports, the glue gun's specifications and the temperature the finished piece will encounter. For a precise joint, check that the layer will not interfere with alignment or leave a conspicuous bead.

Hot glue and the gun nozzle can cause burns; the 3M hot-melt applicator manual states this risk. Follow the instructions for your specific gun; do not assume that all hot-melt adhesives are “non-toxic” or “pollution-free”.

Wood glue, fabric glue, contact adhesive and spray adhesive: choose by project

Use wood glue only for the wood joints listed by its manufacturer. For fabric glue, check how flexible it remains after curing and whether it can be washed. “Fabric glue” is not one standard “alcohol glue” formula, nor does the name guarantee that it is harmless to skin.

Contact adhesives often need to be applied to both surfaces and left for a specified time before the parts are joined; UHU POR, for example, has a two-sided application procedure. Spray adhesive describes a way of applying glue, not a guarantee of material compatibility. 3M's solvent-based adhesive information covers spray applications and warns that not every spray adhesive is compatible with polystyrene. Mask nearby surfaces, provide ventilation and keep away from ignition sources as directed on the product label.

“Glass glue” and “nail-free glue”: do not rely on the nickname

In DIY conversation, “glass glue” often means silicone sealant, commonly used to seal gaps or make a flexible joint. Sodium silicate (“water glass”) is a different material. If you need to secure a load-bearing structure, check that the product lists that use; do not choose it simply because it can bond glass. Loctite's silicone sealant guide also distinguishes sealing from load-bearing uses.

“Nail-free glue” is a broad nickname for construction adhesives; formulas and compatible materials vary, and it is not another name for silicone sealant. For a small 3D model, check the required amount, joint thickness and finishing steps before deciding whether it is suitable.

How should you prepare and bond parts for a reliable joint?

1. Identify both materials. Check the filament label, resin name or object material. If you are unsure, keep a test piece and do not start on the finished object.

2. Dry-fit the parts. Test the joint without glue and check the fit, orientation and alignment. Prepare clamps, tape or a support beforehand so you are not searching for tools after applying adhesive.

3. Prepare the surfaces as directed. Remove dust, oil and loose coatings, then let the surfaces dry. Before sanding or using a cleaner, check that it will not damage the material or finish; one solvent is not right for every surface.

4. Apply or mix the adhesive correctly. Mix two-part adhesives in the specified ratio and manner. Follow any instructions for primer, coating both surfaces or waiting before joining.

5. Align and secure the parts. Join them within the working time and prevent them from slipping. Apply pressure as directed, without crushing thin-walled printed parts.

6. Wait for full cure before testing. Check a sample first, then gradually apply the forces the finished piece needs to withstand. If you plan to fill, sand or paint the joint, check the adhesive's finishing limitations too.

Pay attention to three different times in the product instructions: working time is the period for applying and adjusting the adhesive; handling time is when the joined parts can be moved; and full cure time is when the adhesive has reached its specified cured state. They are not interchangeable.

For example, the Loctite Epoxy Clear technical sheet lists a full cure time of 24 hours, even though the product name and description mention an initial set in minutes. Temperature, humidity and the amount of adhesive can affect the result. Check the technical sheet for the product you use rather than assuming that “five minutes” means the job is finished.

Why does a joint fail, turn white or break easily?

The joint does not hold: check the materials and surfaces first

Confirm that the adhesive supports both materials. If the adhesive peels cleanly from the surface, check for oil, dust, coatings or an incompatible material. If the adhesive remains attached but the print splits along its layer lines, inspect the part and joint design as well. Before switching to a “stronger” glue, find out where and why the joint failed.

The joint turns white: it may be CA blooming

The white haze around a CA joint is called blooming or frosting. Try using less adhesive, improving ventilation while it cures, or testing a low-bloom formula intended for clear finishes. Compare on a sample first. See Henkel's guide to blooming in instant adhesives for possible causes and ways to reduce it. Do not wipe a finished part with an unknown debonder; first check material compatibility.

The part breaks easily: review the joint area and the direction of force

A small butt joint that is repeatedly twisted or peeled may not be fixed by changing glue alone. Consider increasing the bonding area or adding a locating peg or slot. For parts that need to be reused and taken apart, screws or clips may be more suitable. Formlabs' guide to splitting parts and designing joints offers practical ideas.

Want guidance as you complete your own 3D project?

If you are making a multi-part model, display piece or small component and want to learn about material choice, joint design and finishing together, take a look at our Idea to Done 3D Workshop (one-to-one). Bring your idea, model or a photo. We can first discuss what you want to make, then plan suitable learning content.

Sources checked: 30 September 2026. This article brings together manufacturers' public guidance on choosing and using adhesives. Product examples illustrate stated material compatibility and limitations.