Whether you're a seasoned furniture maker or picking up a chisel for the first time, choosing the right adhesive is one of those decisions that separates a project that lasts decades from one that falls apart in damp weather. Get it right and the glue joint will often outlast the wood itself. Get it wrong and no amount of clamping will save you. This guide cuts through the noise: five glue types, honest pros and cons, and straight advice on when to use each one.
The wood species you're working with matters just as much as the glue itself — oily hardwoods behave very differently from softwoods or sheet materials. If you want to get the material side right first, our guide on the best woods for kitchen cabinets is a good starting point, as is the overview of woods suited to exterior doors — two applications where glue choice is critical.
Every adhesive has a character. Some cure rock-hard but are brittle under flex; others stay slightly elastic and absorb vibration. Some are completely impervious to standing water; others soften the moment condensation arrives. The three questions that determine your choice are:
Once those three answers are clear, the right glue usually picks itself. The sections below give you the full picture on each type.
For outdoor furniture and decking projects where glue joints face constant moisture, the species guide on the best woods for decking pairs well with the glue advice further down this page.
For woodworking, five adhesive families cover virtually every situation you'll encounter. Here's a plain-English profile of each.
Polyvinyl acetate, sold simply as wood glue or carpenter's glue, is the default for good reason. It's water-based, low-odour, easy to clean up before it sets, and creates a bond that is at least as strong as the wood fibres themselves in most timber species. The joint line sands cleanly and takes stain without blotching. Standard PVA is an indoor adhesive — it softens when repeatedly wet. Exterior-grade D3 or D4 PVA formulations exist and offer significantly better moisture resistance, so always check the classification on the label if your project will see any damp.
A two-part system — resin plus hardener — that you mix immediately before use. Once cured, epoxy is the strongest adhesive on this list, fully waterproof, and able to bridge gaps rather than requiring a perfectly fitted joint. That gap-filling ability makes it invaluable for repairs where the mating surfaces aren't pristine. The trade-off: you're working against a pot life (the window between mixing and the glue becoming unworkable), and full cure typically takes 24 hours. Epoxy is the go-to for marine and structural applications.
PU glue cures by reacting with moisture, which is why you lightly dampen one surface before applying it. It bonds wood to almost anything — metal, stone, ceramics — and is waterproof once cured. The expansion and foam-out during curing can push joints apart if clamping pressure is inadequate, and that foam stains skin and fabric stubbornly, so gloves are non-negotiable. For outdoor timber projects that will face genuine British weather, polyurethane is often the most practical choice.
The fastest bond on the list, measured in seconds rather than minutes. Cyanoacrylate is ideal for small repairs, tacking components in position before a stronger adhesive is applied, or bonding thin veneers. It has almost no gap-filling ability and can be brittle under impact, so it isn't a structural adhesive. Some woodworkers use thin-viscosity CA glue wicked into cracks to stabilise crumbling grain before turning or carving.
Made from collagen extracted from animal hides and bones, this is what furniture makers used for centuries before synthetics arrived. Its key property is reversibility: mild heat and moisture release the bond, making it invaluable for antique restoration and musical instrument making where disassembly may be needed later. It is not waterproof and is weaker than modern synthetics, but for joining instrument soundboards or repairing period furniture, it remains the technically correct choice.
Use this table as a quick reference when you're at the workbench trying to make a decision.
| Glue Type | Basis | Strengths | Weaknesses | Best For |
|---|---|---|---|---|
| PVA | Water-based | Easy to use, fast open time, cleans up with water, sands well | Standard grades not waterproof; softens when wet | General indoor joinery, furniture assembly |
| Epoxy | Two-part resin | Maximum strength, fully waterproof, fills gaps | 24-hour cure, limited pot life, more complex to mix | Marine, structural repairs, uneven mating surfaces |
| Polyurethane | Moisture-cured | Waterproof, bonds mixed materials, some flex when cured | Foams out, stains badly, requires firm clamping | Outdoor timber, multi-material bonds |
| Cyanoacrylate | Acrylic resin | Near-instant bond, convenient, good for thin materials | No gap-filling, brittle under impact, limited coverage | Small repairs, veneer, tacking before clamping |
| Animal/Hide | Natural protein | Reversible with heat, historically authentic, no creep | Not waterproof, weaker than synthetics, requires heating | Antique restoration, musical instruments |
A quality adhesive applied badly will still fail. These step-by-step methods are how professionals get reliable results every time.
Most domestic softwoods and open-grained hardwoods bond well with standard PVA. The challenge comes with dense, oily tropical hardwoods — the very same species prized for outdoor furniture precisely because of those natural oils.
Teak is the classic example. Its high silica and natural oil content can prevent adhesives from properly wetting the surface, leading to a weak bond even with good technique. The solution: wipe both mating surfaces with acetone or a dedicated teak cleaner immediately before gluing, then apply the adhesive while the surface is still open. Epoxy or exterior-grade PVA both perform well on degreased teak.
For plywood and engineered sheet materials, the same logic applies: indoors, PVA works perfectly; anywhere with moisture exposure, switch to a D4-rated PVA, polyurethane, or epoxy. The glue on best woods for sound insulation in floors covers laminated and engineered options where this is particularly relevant.
Quick species guide:
If you're new to reading wood grain and deciding how to work with a specific species, the guide on woodworking techniques for beginners is worth reading alongside this page.
Understanding adhesives is part of a broader conversation about working with quality wood. If you're investing time in woodworking, it's worth knowing what well-made hardwood construction looks like — and what it takes to maintain it. The swing bench below is a good example of meranti hardwood joinery built to handle outdoor conditions.
For protecting finished outdoor pieces once the glue has cured and the project is assembled, a quality weatherproof cover extends the life of any hardwood significantly. These fitted covers are purpose-built for timber garden furniture:
Most glue failures aren't down to a bad product — they're technique errors that are entirely avoidable.
Epoxy is generally the strongest option available. As a two-part adhesive it cures to a fully waterproof, extremely hard joint that can also fill gaps — useful when mating surfaces aren't perfectly machined. The trade-off is a longer cure time (typically 24 hours for full strength) and more preparation than simply squeezing out a PVA bottle. For most indoor furniture joinery, however, quality PVA on well-fitted surfaces is strong enough that the wood itself will fail before the joint does.
Polyurethane glue is the most versatile choice for outdoor work — it's fully waterproof once cured and bonds wood to a wide range of other materials. Exterior-grade (D4) PVA is a good alternative for straightforward wood-to-wood joints where maximum strength isn't critical. Epoxy is the best option for structural outdoor joints or anywhere water will pool directly on the adhesive. Standard interior PVA is not suitable for outdoor use.
Yes — for indoor furniture, PVA is the industry standard and is used in professional cabinet shops worldwide. When applied correctly to clean, well-fitted surfaces and given adequate clamping and cure time, a PVA joint is typically stronger than the surrounding wood. Apply a thin, even coat to both faces, clamp firmly, and leave for at least two hours before removing clamps. Full strength is reached after 24 hours.
The key step is degreasing. Wipe both mating surfaces with acetone or a specialist teak cleaner and allow to dry for a few minutes — you're aiming to open up the surface fibres without letting the natural oils migrate back. Then apply your adhesive immediately. Exterior-grade PVA and epoxy both perform well on properly prepared teak. Don't skip this step; it's the difference between a lasting joint and one that peels apart within a season.
Hide glue (animal glue) is the traditional and technically correct choice for antique restoration. Its key advantage is reversibility: gentle heat and moisture will release the bond, allowing joints to be taken apart for proper repair without damaging old wood. This is especially important for period furniture and wooden musical instruments. It is weaker than synthetic adhesives and not waterproof, so it's unsuitable for outdoor or heavily loaded structural joints.
Yes, and it's genuinely useful for specific tasks: small repairs, bonding thin veneers, tacking small components in position while a stronger adhesive cures, or stabilising crumbling grain before turning or carving. What it won't do is create a structural joint — it has almost no gap-filling ability and can be brittle under impact. Use it as a tool for precise, small-scale work rather than as a primary structural adhesive.
Good adhesive technique is one piece of the puzzle. The wood you choose, the joints you cut, and the finish you apply all interact to determine whether a piece lasts years or decades. For more on working intelligently with timber, explore our related guides:
