Adhesive guide
Wood Glue Types and Strength, Compared
Compare PVA, polyurethane, epoxy, hide, and CA glues on strength, set time, and water resistance, with charts to pick the right adhesive for your joint.
Research Lens
How can a personal builder use CutList to finish wood glue types and strength, compared with fewer mistakes?
The hobby workflow is strongest when the app is used as a planning checkpoint: define the project, enter accurate stock and parts, generate a visual layout, then use cost, waste, grain, kerf, PDF export, project history, and offline access to control the real cutting session.
Decision Metrics
Visual model
Pick glue by joint and environment
Strength, set time, and water resistance trade off. PVA covers most interior work.
The Glue Is Often The Joint
In most woodworking, the glue line carries the load, so choosing the right adhesive matters as much as the joinery. A well-made glue joint on long grain can be stronger than the surrounding wood. But glues differ widely in set time, water resistance, gap filling, and reversibility, so the best choice depends on the joint, the environment, and how fast you need to work.
PVA Is The Everyday Workhorse
Yellow and white PVA glues are the default for interior woodworking: strong on long grain, easy to clean up with water, and inexpensive. Type II PVA adds water resistance for occasional damp exposure. PVA needs clamping and good surface contact, and it does not fill gaps well, so it rewards tight-fitting joints and firm clamp pressure.
Polyurethane And Epoxy For Tough Jobs
Polyurethane glue foams to fill small gaps and resists water, making it useful for exterior work and imperfect joints, though the foam is messy and it needs moisture to cure. Epoxy is the gap-filler and structural champion: it bonds dissimilar materials, fills voids, and resists water, at the cost of mixing and higher price. Reserve these for jobs PVA cannot handle.
Specialty Glues: Hide And CA
Hide glue is reversible with heat and moisture, prized for instruments and antique repair where future disassembly matters. Cyanoacrylate, or CA, sets in seconds and is great for small parts, tacking, and quick fixes, but it is brittle under load. These specialty glues solve narrow problems the everyday adhesives do not.
Match Glue To Joint And Environment
Decide by use: PVA for most interior joints, Type II or polyurethane for damp exposure, epoxy for gaps and dissimilar materials, hide glue for reversibility, CA for speed. Respect clamp and cure times so the joint reaches full strength before stress. Test on offcuts when bonding an unfamiliar material to confirm the glue holds.
Data charts
Compare
Wood glue at a glance
| Glue | Strength | Water resist | Best for |
|---|---|---|---|
| PVA (yellow) | High on long grain | Low to moderate | Most interior joints |
| Polyurethane | High | High | Exterior, small gaps |
| Epoxy | Highest, gap-filling | High | Voids, dissimilar materials |
| Hide / CA | Moderate | Low | Reversible work / quick fixes |
Field Checklist
- Use PVA for most interior joints.
- Use Type II or polyurethane for damp exposure.
- Use epoxy for gaps and dissimilar materials.
- Respect clamp and cure times.
- Test unfamiliar bonds on offcuts.
FAQ
Common questions
What glue is strongest for wood?
On a good long-grain joint, PVA and epoxy are both very strong; epoxy also fills gaps and bonds dissimilar materials.
Which wood glue is waterproof?
Polyurethane and epoxy resist water well; for interior PVA, use Type II for occasional damp exposure.
How long do I clamp wood glue?
PVA typically clamps about 30 minutes and cures fully in a day; epoxy and polyurethane need longer.
When should I use epoxy?
When filling gaps, bonding dissimilar materials, or needing maximum structural strength and water resistance.
Sources