Wood Glue Guide: Which Type for Which Job?

Walk into the adhesives aisle at any hardware shop and you’ll be confronted by a wall of bottles, all promising to be the strongest, most versatile, most revolutionary glue ever made. For woodworking specifically, the reality is simpler than the marketing suggests: there are five main types of wood glue, each with clear strengths and weaknesses, and choosing the right one for your project is mostly common sense once you understand what each does.

This guide breaks down the types of wood glue you’ll actually use, when to reach for each one, and — just as importantly — when not to. I’ll also cover how to get the strongest possible glue joint, because the glue itself is only part of the equation.

The 5 Main Types of Wood Glue

PVA (Yellow Glue) — The All-Rounder

If you only buy one wood glue, make it PVA. Specifically, a wood-specific PVA (often sold as “yellow glue” or “carpenter’s glue”) rather than regular white PVA. The yellow/aliphatic resin version sets harder, sands better, and has a stronger initial grab than the white stuff you used at school.

Strengths:

• Strong — a properly clamped PVA joint is stronger than the wood itself
• Cheap — a 500ml bottle costs around £5–8
• Easy clean-up with a damp cloth before it sets
• Non-toxic when dry
• Long open time (10–15 minutes) — gives you time to position and clamp
• Sands and planes cleanly

Weaknesses:

• Not waterproof (standard PVA) — breaks down with prolonged moisture
• Needs tight-fitting joints — poor gap-filling ability
• Clamping required for 30–60 minutes; full cure in 24 hours
• Doesn’t stain well — can leave pale patches if squeeze-out isn’t cleaned up

Best for: Indoor furniture, cabinetry, edge joints, face joints, any woodworking project that stays dry.

Waterproof PVA (Type II and III): Products labelled as “water-resistant” (Type II) or “waterproof” (Type III) PVA exist and are worth the slight premium for outdoor furniture, window frames, or anything that might get damp. Titebond III is a popular Type III option.

Polyurethane (Gorilla Glue) — Gap-Filling Power

Polyurethane glue is the one that foams as it cures. It’s moisture-activated — you dampen one surface before applying, and the glue expands into gaps as it sets. This makes it brilliant for joints that aren’t perfectly tight.

Strengths:

• Genuinely waterproof — handles outdoor use and total submersion
• Excellent gap-filling — expands into voids and irregular surfaces
• Bonds wood to non-wood materials (metal, stone, ceramic)
• Works on slightly damp surfaces (actually needs some moisture to cure)

Weaknesses:

• The foam expansion is messy — squeeze-out is difficult to remove once cured
• Cured foam is weaker than the surrounding glue — the expansion doesn’t add strength in gaps
• More expensive than PVA (roughly £8–15 per bottle)
• Shorter shelf life once opened — it cures in the bottle if moisture gets in
• Requires clamping to prevent the foaming from pushing joints apart
• Stains skin — wear gloves. Seriously.

Best for: Outdoor projects, rough-cut timber, joints where surfaces don’t meet perfectly, bonding wood to other materials.

Epoxy — When Strength Is Everything

Two-part epoxy comes in separate resin and hardener components that you mix immediately before use. It’s the strongest adhesive available for woodworking, and it’s the go-to choice when the joint has to withstand serious stress or when you’re bonding end grain (which PVA handles poorly).

Strengths:

• Extremely strong — particularly on end grain and cross-grain joints
• Excellent gap-filling — thickened epoxy fills voids without losing strength
• Waterproof
• Can be sanded, shaped, and painted when cured
• Bonds almost any material to almost any other material
• Available in various cure times (5-minute, 30-minute, 24-hour)

Weaknesses:

• Expensive — two-part epoxy costs £10–25 per pack
• Messy — requires mixing, and uncured epoxy is hard to clean up
• Limited open time with fast-setting versions
• Exothermic reaction — large batches generate heat. Don’t mix big volumes in a container.
• Not great for large surface area joints — PVA is better for edge-to-edge glue-ups

Best for: Structural repairs, end-grain joints, filling voids and knot holes (mixed with wood dust), bonding different materials, boatbuilding.

CA Glue (Super Glue) — Quick Fixes and Turning

Cyanoacrylate (CA) glue — what most people call super glue — sets in seconds and forms a hard, brittle bond. It’s not a primary wood glue, but it’s invaluable for specific tasks.

Strengths:

• Sets in 5–30 seconds (thin CA) — instant bonding
• Available in thin (penetrating), medium, and thick (gap-filling) viscosities
• Combined with an accelerator spray, it’s instant and permanent
• Brilliant for small repairs, pen turning, and reinforcing grain

Weaknesses:

• Brittle — not suitable for joints under stress
• No repositioning — you get one chance
• Bonds skin instantly (always keep CA debonder nearby)
• Expensive per millilitre compared to PVA
• Fumes can irritate eyes — use in a ventilated area

Best for: Pen and bowl turning (stabilising blanks, gluing cracks), small repairs, temporary positioning, reinforcing punky or soft grain before cutting.

Hide Glue — Traditional Woodworking

Hide glue has been used for thousands of years and is still the preferred adhesive for musical instrument building, antique restoration, and traditional furniture making. It’s made from animal collagen — yes, it’s exactly what it sounds like.

Strengths:

• Reversible — a joint can be separated with heat and moisture, making repairs possible
• Doesn’t creep under load like some modern adhesives
• Transparent when dry — won’t affect stain absorption
• Available as hot hide glue (traditional) or liquid hide glue (more convenient)

Weaknesses:

• Not waterproof
• Hot hide glue requires a glue pot and has a short open time
• Lower strength than PVA or epoxy in most tests
• Liquid hide glue has a limited shelf life

Best for: Instrument building, antique restoration, veneering, rubbed joints, any project where future repairability matters.

Quick Reference Table: Which Glue for Which Job

Indoor vs Outdoor — Waterproofing Matters

This is the first question to ask: will this project get wet?

Standard PVA is fine indoors, but it will fail in prolonged outdoor exposure. The joint won’t necessarily fall apart immediately, but moisture weakens the bond over months, and freeze-thaw cycles accelerate the process.

For outdoor use, your options are:

• Waterproof PVA (Type III) — best for standard woodworking joints exposed to weather
• Polyurethane — best for rough joints, mixed materials, and anything submerged or in constant contact with moisture
• Marine epoxy — the ultimate waterproof bond for structural outdoor applications

If you’re building something that lives outdoors — a garden bench, planter, gate — spend the extra pound or two on waterproof glue. The timber itself will outlast a standard PVA joint in UK weather.

How to Get the Strongest Glue Joint

Clamping Pressure and Time

Glue alone isn’t enough — you need clamping pressure to create a thin, even glue line. A thick layer of glue is actually weaker than a thin one, which is counterintuitive but true. The clamps squeeze out excess glue and bring the wood surfaces into intimate contact, which is where the real strength comes from.

• PVA: Clamp for a minimum of 30–60 minutes. Leave overnight for maximum strength. Use firm pressure but don’t go mad — you can starve the joint of glue by over-clamping.
• Polyurethane: Clamp for 1–2 hours. The glue foams as it cures, so firm clamping is essential to prevent the joint from being pushed apart.
• Epoxy: Clamping is less critical because epoxy fills gaps, but light clamping ensures alignment. Cure time depends on the formulation — check the instructions.

Surface Preparation

A good glue joint starts with good surfaces. Here’s what matters:

• Clean and dry. Dust, oil, and moisture all compromise the bond.
• Freshly machined. Wood surfaces oxidise and lose absorbency over time. If you milled the joints a week ago, give them a light sanding before gluing.
• Good fit. PVA especially needs tight-fitting joints. If you can see light through the joint when you dry-fit it, rethink the joint or switch to a gap-filling glue.
• Don’t over-sand. Very fine sanding (above 220 grit) can actually burnish the surface and reduce glue adhesion. Stop at 150–180 grit on glue surfaces.

My Go-To Wood Glues (What I Keep on the Shelf)

After years of testing various types of wood glue, here’s what’s always on my shelf:

Everyday PVA: A 500ml bottle of good-quality wood PVA. This handles 80% of everything I glue. I get through a bottle every couple of months.

Waterproof PVA: A smaller bottle for anything that might get damp. Outdoor furniture, garden projects, bathroom shelving.

5-Minute Epoxy: For quick structural repairs and end-grain bonding. A two-syringe type is convenient for small batches.

CA Glue Set: Thin, medium, and thick viscosities plus an accelerator spray. Essential if you do any turning, and handy for quick fixes on everything else.

Polyurethane Glue: Used less often, but indispensable when I need gap-filling on rough timber or need to bond wood to something non-porous.

The truth about wood glue is that the “best” glue is the right one for the job, not the most expensive one on the shelf. A £5 bottle of PVA, properly applied to a clean, tight-fitting joint with adequate clamping, will outperform a £20 bottle of fancy epoxy slathered on a poorly prepared surface every time. Understand what each type does, match it to your project, and follow the basics of surface prep and clamping. That’s genuinely all there is to it.