Wood Glue Guide: PVA, Epoxy, Polyurethane, CA, and Hide Glue Explained

Walk into any hardware store and the glue aisle is overwhelming — yellow glue, white glue, polyurethane glue, two-part epoxy, super glue in six viscosities, hide glue, contact cement, and more. For most woodworking tasks, one glue type is clearly the right choice. But using the wrong glue in the wrong situation leads to weak joints, messy clamping sessions, or worse — a joint that looks good but fails under load.

This guide is a complete reference for every wood glue type you will encounter. Use the quick comparison chart to find what you need, then read the detailed sections to understand why.

Quick Comparison Chart

Glue Type	Water Resistance	Open Time	Gap Filling	Sandability	Best Use
PVA / Yellow (Titebond Original)	None	5 min	Poor	Excellent	Interior furniture, general joinery
Titebond II	Moderate	5 min	Poor	Excellent	Interior/outdoor occasional exposure
Titebond III	High	8 min	Poor	Good	Outdoor, high-humidity applications
Polyurethane (Gorilla)	Excellent	10–20 min	Good	Poor	Oily woods, mixed materials
Epoxy (West System)	Excellent	Varies	Excellent	Good	Outdoor, boat work, gap filling
CA Glue (thin)	Poor	Seconds	None	Poor	Small repairs, quick fixes
Hide Glue (hot)	None	Short	Poor	Excellent	Antique restoration, instrument making
Liquid Hide Glue	None	30 min	Poor	Excellent	Furniture repair, traditional work

Yellow / PVA Glue (Aliphatic Resin)

Yellow glue — properly called aliphatic resin or PVA (polyvinyl acetate) — is the workhorse of the woodworking shop. Titebond is the dominant brand and the benchmark against which other glues are measured. For interior woodworking, it is the right choice the vast majority of the time.

Titebond Original vs. Titebond II vs. Titebond III

Titebond Original is the standard yellow woodworking glue. It has an open time of roughly 4–5 minutes (time after application before the joint must be closed and clamped), and it cleans up with water before it cures. It sands cleanly without gumming up sandpaper. It creates a bond stronger than the wood itself in a properly mated joint. It is not water resistant.

Titebond II adds Type II water resistance — it can withstand short-term water exposure and is suitable for projects that may see occasional moisture (outdoor furniture that will be stored indoors, cutting boards that will be washed). It costs slightly more than Original and has similar open time. Titebond II passes the ANSI/HPVA Type II water resistance test.

Titebond III is the premium option, with Type III water resistance. It can withstand prolonged water exposure — suitable for exterior furniture and marine applications. Open time is slightly longer at 8–10 minutes, which is useful for complex glue-ups. It meets the ANSI/HPVA Type III standard, the highest for wood adhesives. Titebond III is also FDA approved for indirect food contact when cured, making it appropriate for food-serving items like charcuterie boards and salad bowls.

Application Tips for PVA Glue

Apply an even coat to both mating surfaces using a roller, brush, or glue spreader. Applying to both surfaces ensures adequate glue at the joint.
Clamp within the open time. After the open time passes, the glue begins skinning over and the bond will be weak. Work quickly on complex glue-ups.
Clamping pressure should be snug, not crushing. The goal is full contact with even pressure, not squeezing all the glue out. Proper clamping pressure produces a thin, even bead of squeeze-out along the full length of the joint.
Clean up squeeze-out with a damp rag before it cures (it will be rubbery for about 30 minutes). Dried PVA glue does not accept stain — invisible dried glue residue is one of the most common causes of blotchy staining.
Temperature matters: PVA glues require temperatures above 50°F (ideally above 65°F) to cure properly. Working in a cold garage in winter will result in weak bonds.
Full cure time is 24 hours. You can unclamp after 30–60 minutes but do not stress the joint until fully cured.

Polyurethane Glue (Gorilla Glue, Titebond Polyurethane)

Polyurethane glue has a devoted following and a reputation that sometimes exceeds what it actually delivers. It is a specialty glue, not an all-purpose replacement for PVA.

How Polyurethane Glue Works

Polyurethane glue cures through a chemical reaction with moisture — from the wood surface and from ambient humidity. This is why you are instructed to dampen one of the mating surfaces before application. As it cures, it expands, sometimes dramatically, filling gaps and foaming out of the joint.

When to Use Polyurethane Glue

Oily exotic woods: Species like teak, cocobolo, ipe, and rosewood contain natural oils that interfere with PVA adhesion. Polyurethane glue bonds reliably where PVA may fail. Wipe the surface with acetone just before gluing to remove surface oils.
Bonding non-porous materials: Polyurethane glue bonds wood to metal, stone, ceramic, and other non-porous materials where PVA has no grip.
Gap filling: The foaming expansion fills small gaps in joinery. This is not a substitute for well-fitted joints, but it helps.

Downsides of Polyurethane Glue

Messy foaming: The expanding foam squeeze-out is extremely difficult to remove and stains skin a dark brown that takes days to wear off. Always wear gloves.
Poor sandability: Cured polyurethane glue is hard and rubbery. It does not sand cleanly and clogs sandpaper.
Shorter shelf life once opened: Moisture in the air begins curing the glue in the bottle. Store tightly sealed and use within 6–12 months of opening.

Epoxy

Epoxy is a two-part adhesive system — a resin and a hardener mixed together in a specified ratio. Once mixed, a chemical reaction begins that cures the epoxy to a hard, waterproof, gap-filling adhesive. Epoxy is genuinely excellent at what it does, but it is overkill for standard woodworking joinery.

When Epoxy Is the Right Choice

Outdoor and marine applications: Epoxy is fully waterproof and does not degrade with water exposure over time. West System and System Three are the standard brands for serious marine and outdoor work.
Gap filling: Where joint surfaces cannot be perfectly mated — irregular shapes, end grain, cracked or punky wood — epoxy fills the gaps and still creates a strong bond. PVA requires near-perfect contact.
Bonding to non-wood materials: Fiberglass, metal, and other materials bond well with epoxy.
Stabilizing punky or soft wood: Thin epoxy can be used to consolidate and harden soft or deteriorated wood fibers before finish work.

Cure Times

5-minute epoxy: Fast setup, limited working time. Convenient for small repairs but lower strength than slower-cure epoxies.
30-minute epoxy: Good balance of working time and strength. Suitable for most shop tasks.
Overnight epoxy: Maximum strength and the longest working time. Required for complex assemblies.

Temperature significantly affects epoxy cure time — cold slows it, warmth accelerates it. Mix ratios are critical: off-ratio mixing produces weak, sticky results.

CA Glue (Cyanoacrylate / Super Glue)

Cyanoacrylate glue — universally known as CA or super glue — is an instant-bonding adhesive that works by reacting with surface moisture to polymerize almost instantly. In the woodworking shop, CA glue has specific, useful applications.

Viscosity Options

CA glue comes in three useful viscosities:

Thin: Water-like consistency. Wicks deeply into tight joints and porous surfaces by capillary action. Used for hardening soft wood fibers, reinforcing cracks, and bonding close-fitting parts.
Medium: General purpose. The most commonly used for shop repairs.
Thick (gel): For gap-filling applications and vertical surfaces where thin would run. Takes longer to cure.

Using an Accelerator

CA accelerator (also called activator or kicker) is a spray that dramatically speeds up CA cure time — from minutes to seconds. Spray accelerator on one surface, apply CA to the other, press together, and the joint is immediately cured. Extremely useful for:

Attaching jig components quickly
Small repairs that need immediate handling
Laminating thin stock

One useful shop trick: use CA glue and accelerator to attach sacrificial blocks to workpieces for holding during turning or carving, then pry them off cleanly when done.

Limitations of CA Glue

Low gap-filling ability (thin and medium viscosities)
Brittle when cured — not suitable for structural joints under dynamic or shear loads
Poor long-term water resistance
Short shelf life — store in the refrigerator to extend life, and let it warm to room temperature before use

Hide Glue: Traditional and Reversible

Hide glue is made from collagen extracted from animal hides. It was the dominant woodworking adhesive for centuries, and it is still the preferred choice in specific applications today — particularly furniture restoration and musical instrument making.

Why Hide Glue Matters

The defining characteristic of hide glue is that it is reversible. Apply heat and moisture to a hide glue joint and it releases — cleanly, without damaging the wood fibers. This is invaluable when repairing antique furniture, where you need to disassemble old joints without destroying the original wood. It is also why hide glue is standard in lutherie (guitar and violin making) — instruments can be repaired without destroying the instrument.

Hide glue also creeps less than PVA under sustained load, which matters for certain applications.

Hot Hide Glue

Traditional hot hide glue is prepared by soaking dried glue granules in water, then heating to approximately 140–145°F in a glue pot. It must be used at temperature — it gels as it cools, so you work quickly. This is the traditional form, used by fine furniture makers and instrument builders who prioritize performance over convenience.

Liquid Hide Glue

Liquid hide glue (Old Brown Glue is a well-known brand, as is the Titebond version) has a longer open time and requires no heating. It is a legitimate hide glue, just with additives that keep it liquid at room temperature. It is the practical choice for woodworkers who want the reversibility of hide glue without a glue pot. Open time of 20–30 minutes makes it more forgiving than hot hide glue for complex assemblies.

Specialty Adhesives

Construction Adhesive (Liquid Nails, PL Premium)

Construction adhesives are designed for bonding framing lumber, subfloor panels, and other structural applications. They are high-viscosity, gap-filling, and generally not sandable. Not appropriate for fine furniture — these are site adhesives.

Contact Cement

Contact cement is used to bond high-pressure laminate (Formica and similar products) to substrates. You apply to both surfaces, let it flash off to dry, then press the surfaces together — they bond on contact with no clamping required. Positioning must be exact before contact, because the bond is immediate. Water-based versions are safer than solvent-based.

DAP Plastic Wood / Wood Fillers

These are not true adhesives — they are gap-filling compounds used to fill cracks, nail holes, and defects before finishing. Useful for cosmetic repairs but not structural.

Application Best Practices

Regardless of glue type, these principles apply:

Surface preparation: Glue bonds to wood fiber, not to sawdust, oil, or finish. Joint surfaces should be freshly machined or planed — never sanded smooth with fine grit (which closes the wood pores).
Even spread: Use a foam roller, brush, or dedicated glue applicator to get consistent coverage. Skips in coverage produce weak spots.
Clamping pressure: Snug and even. Watch the squeeze-out — a thin, continuous bead along the full joint is the sign of proper pressure and adequate glue. No squeeze-out means insufficient glue or pressure; heavy foam means too much glue.
Open time vs. closed time: Know the difference. Open time is how long after application you can close the joint. Closed time (assembly time) includes the open time plus time to position and clamp. Complex glue-ups may require longer open time — consider Titebond III or epoxy.
Temperature and humidity: Cold temperatures slow or prevent curing. High humidity can extend open time but may weaken some glues. Work above 50°F for all PVA-type glues.

For most interior woodworking, Titebond III is the one glue worth keeping on the shelf if you want a single option that covers the widest range of applications — from furniture joints to cutting boards to light outdoor use.