Quick Answer: Which Glue Should You Use
For most wood furniture repairs, a high-quality polyvinyl acetate (PVA) woodworking glue is the best all‑round choice: easy to apply, strong bond, good gap filling, and reversible with heat if needed. Use epoxy for very tight gaps, heavy stress, or when you need a waterproof, temperature‑stable bond; use liquid hide glue where you want reversible, traditional characteristics on antiques; and use cyanoacrylate (instant/crazy glue) for small, quick fixes on veneer or repairs where clamping is difficult. In practice, many woodworkers keep multiple adhesives on hand to match the joint and furniture type.
Overview of Common Wood Adhesives
Polyvinyl Acetate (PVA) Wood Glue
Standard yellow carpenter’s glue and its higher‑performance cousins (brown, polyurethane, and crosslink PVA) are easy to use, provide good bond strength in furniture joints, clean up with water before cure, and allow disassembly with heat. They cure quickly enough for light handling in a few hours, reach full strength in 24–72 hours, and hold paint/stain well. Suitable for edge‑gluing boards, mortise‑and‑tenon, dowels, and general case‑goods repairs.
Epoxy (Resin + Hardener)
Epoxy fills large gaps, bonds dissimilar materials, and excels where moisture, heat, or chemical resistance is needed. It is a two‑component system that cures via chemistry rather than moisture loss, so thickness and open time are set by the formulation. Great for structural repairs, cracked miter joints, and stabilizing loose veneer, though it can be more expensive and less reversible than PVA or hide glue.
Hide Glue (Traditional Animal Glue)
Hide glue—made from collagen—has been used for centuries in furniture and instrument making. It sets by cooling and reheats above about 60–65°C (140–150°F), making joints reversible. It provides good impact resistance and is favored for period‑correct restoration because it does not stain wood like some synthetic glues. Drawbacks include a relatively short open time and more finicky handling.
Cyanoacrylate (Instant/Crazy Glue)
Thin, fast‑setting cyanoacrylate is useful for small repairs, loose veneer, or when clamps cannot be applied. It bonds quickly and can penetrate end grain well, but brittle bonds and limited gap fill make it unsuitable as the primary adhesive for large load‑bearing joints.
Match the Adhesive to the Joint
- Edge‑gluing table tops and panels: PVA or polyurethane glue.
- Mortise‑and‑tenon or dowel joints in chairs, tables, and cabinetry: PVA or hide glue for traditional work.
- Large gaps, cracked epoxy‑like finishes, or non‑wood inserts: epoxy.
- Veneer patches and small loose areas: thin CA glue, applied with pins or clothespins.
Properties at a Glance
| Adhesive | Key Attributes | Open Time | Markings in Furniture | Reversibility |
|---|---|---|---|---|
| PVA wood glue | Good gap fill, rigid after cure, paintable | 5–20 minutes | None visible; may show as a thin line under finish | Reversible with heat (disassemble with a steam box or controlled heat) |
| Epoxy | High strength, gap‑filling, waterproof | 5 minutes – several hours (by formulation) | Often tan, amber, or black; can be almost invisible if tinted to match | Generally not reversible; removal is mechanical |
| Hide glue | ||||
| Cure in air, moderate gap fill | 10–30 minutes | None visible; historically clear or pale | ||
| Heat‑reversible above ~60–65°C (140–150°F) | ||||
| Cyanoacrylate | Very fast set, low gap fill, brittle | Seconds to a few minutes | Can leave white haze on wood; small amount may be almost invisible | Not reversible; removal is mechanical |
Practical Tips for Application and Clamping
Apply a thin, even bead to both surfaces and assemble promptly; PVA and hide glue stay workable a few minutes, while epoxy and CA set much faster. Use even clamping pressure across the joint—avoid overtightening that can squeeze out too much adhesive or deform the workpiece. Remove excess glue before it cures; cleanup is easiest while the joint is still wet. After curing, clean off residual hardened glue with a sharp chisel, sand, or a solvent appropriate for the adhesive (test in an inconspicuous area first). Allow sufficient cure time before stressing the repair; PVA often reaches handling strength in a few hours and full strength in 24–72 hours, while epoxy may be handled sooner but should reach full strength per the manufacturer’s guidance.
Wood Movement Considerations
Furniture must survive seasonal humidity changes, so the adhesive should allow some movement at the joint rather than locking everything rigidly. PVA and epoxy are relatively stiff and can fracture if the surrounding wood moves significantly; hide glue and flexible PVA formulations are more accommodating. Avoid rigid adhesives at the interface of solid wood panels and frames where differential movement is expected—this is a common cause of cracked veneers or broken rails.
Surface Preparation and Best Practices
Strong bonds depend on clean, dry surfaces free of finishes, dirt, and old glue. Where needed, use a controlled heat source or solvents to remove old glue, and be careful not to damage surrounding veneer or wood. For difficult nonporous surfaces, lightly roughen with fine sandpaper to increase adhesive tooth. Choose adhesives rated for interior furniture use when possible; if moisture exposure is likely, favor PVA or epoxy formulated for exterior or high‑humidity conditions. Always follow the manufacturer’s mixing ratios, open‑time guidance, and clamp pressure recommendations for the best results.
Summary and Recommendation
For everyday furniture repairs in a home workshop, a quality PVA woodworking glue is the best all‑purpose adhesive due to its balance of strength, ease of use, and reasonable reversibility. Keep a small amount of epoxy on hand for gap‑filled or waterproof joints, hide glue for period‑accurate restoration, and cyanoacrylate for quick veneer fixes. Match the adhesive to the joint, prepare surfaces, apply evenly, clamp appropriately, and allow full cure before returning the piece to use.