---
title: "Which glue works on foam?"
description: "A foam-safe water-based adhesive or low-temperature hot melt — solvent adhesives dissolve polystyrene on contact. The ranked options, the technique that changes the "
url: https://atoneplace.net/which/glue-foam/
site: "At One Place"
---

# Which glue works on foam?

**Which glue works on foam?: A foam-safe water-based adhesive or low-temperature hot melt — solvent adhesives dissolve polystyrene on contact.**

Expanded and extruded polystyrene are dissolved by many common solvents — acetone, toluene, xylene and the carriers in most solvent contact adhesives — so the adhesive eats a groove in the foam and the joint collapses. Polyurethane and polyethylene foams are far more tolerant, which is why upholstery work can use products that would ruin a model. Because manufacturers change formulations, the reliable procedure is to test on an offcut rather than trust a label, and "foam safe" on a can means the maker has done that test for you. The other quiet problem is cure: closed-cell foam is impermeable, so a water-based adhesive between two large sheets can stay wet for days.

## The options, ranked

*Ranked best-first for the stated job. The third column is why the others exist.*

| Option | Good at | Bad at |
| --- | --- | --- |
| Foam-safe spray adhesive | Covers large areas evenly with no solvent attack, and the standard for upholstery foam and craft polystyrene. | Overspray travels, and the bond is modest until it has fully cured. |
| PVA or white craft glue | Cheap, safe on every foam, and strong enough for craft work. | Very slow to dry between two closed-cell surfaces, because the water has nowhere to go. |
| Low-temperature hot melt | Instant grab and no solvent, which is what makes it usable on thin polystyrene. | A standard-temperature glue gun melts a crater straight through the foam. |
| Polyurethane adhesive | Strong and gap-filling on polyurethane and polyethylene foams. | Foams as it cures, so it pushes parts apart unless they are weighted. |
| Contact cement | Excellent on polyurethane upholstery foam, with instant grab over a large area. | Solvent grades destroy expanded polystyrene, and the fumes need real ventilation. |

## Technique that changes the outcome

1. Test any unfamiliar adhesive on an offcut and watch for five minutes, not five seconds
2. Apply in thin lines or a stipple rather than a flood, so water or solvent can escape
3. Weight the joint lightly and evenly; foam crushes under a clamp
4. For polystyrene, keep a low-temperature glue gun rather than a standard one

## What goes wrong

- Solvent-based contact adhesive or superglue accelerator on polystyrene
- Standard hot melt on thin foam sheet
- Assuming an adhesive that worked on upholstery foam is safe on packing foam

> Compiled practical guidance rather than a published standard. Product formulations vary by brand and market, so read the label — and where the work is structural, electrical or gas, the regulations that apply where you are govern rather than anything here.

## Other glue and adhesive questions

| For | Use |
| --- | --- |
| Plastic | It depends entirely on which plastic — identify it first, because solvent cement is unbeatable on some and useless on others. |
| Polypropylene and polyethylene | Ordinary adhesives cannot wet these plastics at all. Use a polyolefin primer with cyanoacrylate, an MMA structural adhesive, or weld the plastic. |
| Wood | PVA wood glue for anything indoors; a water-resistant grade (Type I / D4) or polyurethane for anything that gets wet. |
| Metal | Two-part epoxy for anything structural, cyanoacrylate for small dry parts, and MMA where the surface cannot be properly prepared. |
| Ceramic and pottery | Two-part epoxy for anything that will be handled or loaded, cyanoacrylate for a clean break on a display piece — and neither is dishwasher-proof. |
| Shoes | A flexible shoe repair adhesive — polyurethane or a neoprene contact cement — never superglue, which cracks within a day of walking. |
| Fabric | A washable fabric adhesive or a fusible bonding web — and never superglue, which reacts with cotton violently enough to burn. |
| Glass | UV-cure glass adhesive for an invisible joint, clear epoxy where it must hold load, and neutral-cure silicone where it must stay flexible or wet. |
| PVC pipe | PVC solvent cement with its matching primer — and PVC, CPVC and ABS cements are not interchangeable. |
| Tiles | A cement-based thin-set in almost every case; ready-mixed tub adhesive only on small dry walls, never on floors or in showers. |
| Phone screens | A pre-cut adhesive gasket, or a flexible B-7000-type adhesive around the frame — superglue destroys screens and is the classic mistake. |
| Rubber | Contact cement for large flexible areas and rubber-toughened cyanoacrylate for small ones — but silicone and EPDM need a primer or they will not bond at all. |
| Outdoor and waterproof joints | Polyurethane or epoxy for rigid joints, MS polymer where the joint has to move — and check the water-resistance class rather than the word "waterproof". |
| Acrylic (Perspex, Plexiglas) | A solvent cement run into the joint by capillary action — not a tube adhesive, which will always look like a repair. |
| Concrete | Epoxy or a construction adhesive for bonding to it, and a chemical anchor resin — not glue — for anything that carries load. |
| Leather | Contact cement for a permanent flexible bond, or a leather-craft PVA to hold pieces while you stitch them. |
| Silicone | Effectively only more silicone, and even that needs a primer — and any silicone residue left on a surface stops everything else sticking too. |
| Paper | A glue stick or PVA for everyday work; wheat starch paste or methylcellulose for anything you want to survive — and never tape. |
| Polycarbonate | A urethane or silicone adhesive is safest; solvent cements work but polycarbonate is unusually prone to stress cracking days later. |

## Common questions

### Which glue works on foam?

A foam-safe water-based adhesive or low-temperature hot melt — solvent adhesives dissolve polystyrene on contact.

### What should I avoid?

Solvent-based contact adhesive or superglue accelerator on polystyrene Standard hot melt on thin foam sheet Assuming an adhesive that worked on upholstery foam is safe on packing foam

## Related pages

- [Which glue works on plastic?](https://atoneplace.net/which/glue-plastic/)
- [Which glue works on polypropylene and polyethylene?](https://atoneplace.net/which/glue-polypropylene/)
- [Which glue works on wood?](https://atoneplace.net/which/glue-wood/)
- [Which glue works on metal?](https://atoneplace.net/which/glue-metal/)
- [Which glue works on ceramic?](https://atoneplace.net/which/glue-ceramic/)
- [Which glue works on shoes?](https://atoneplace.net/which/glue-shoes/)
- [Which glue works on fabric?](https://atoneplace.net/which/glue-fabric/)
- [Which glue works on glass?](https://atoneplace.net/which/glue-glass/)
- [Which glue works on PVC pipe?](https://atoneplace.net/which/glue-pvc-pipe/)
- [Which adhesive should I use for tiles?](https://atoneplace.net/which/glue-tile/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)