Of all the adhesives I keep in my shop, cyanoacrylate is one of the most versatile. Better known as CA glue or super glue, it bonds quickly, works with a wide range of materials, and handles some woodworking tasks that conventional yellow wood glue simply isn't suited for.
I use it for everything from securing small inlays and repairing cracks to temporarily positioning parts and finishing small turnings. The key is knowing which formulation to reach for and understanding where CA glue works best.
What Is CA Glue?
Cyanoacrylate is an acrylic adhesive that cures rapidly in the presence of moisture on the surfaces being bonded. Unlike typical PVA wood glue, it doesn't require a long clamping period, and unlike a two-part epoxy, it doesn't require you to mix in a separate hardener.
That fast cure makes CA glue particularly useful for small repairs and assemblies that would be awkward to clamp. It can also bond wood to certain metals, plastics, and other materials, opening up possibilities for decorative inlays and shop-made jigs.
However, CA glue isn't the right choice for every woodworking joint. Its quick setting time leaves little room for adjustment, and its relatively brittle bond can be vulnerable to impact or movement. For large furniture assemblies and conventional long-grain wood joints, I still reach for regular wood glue.
Choose the Right CA Glue Thickness
CA glue is commonly available in thin, medium, and thick formulations. Each has a different consistency, and choosing the right one makes a big difference in how well the glue works for a particular task.
Thin CA Glue for Hairline Cracks
Thin CA glue flows almost like water. Its low viscosity allows it to wick into narrow cracks and other tight spaces that would be difficult to reach with thicker adhesives.
I find it particularly useful for stabilizing small cracks in a workpiece. Apply a small amount at the opening and let capillary action draw the glue inside. Because it flows so readily, use it sparingly and protect nearby surfaces from drips.
Medium and Thick CA Glue for Repairs and Inlays
Medium CA glue stays where you put it a little better, making it useful for general shop repairs and attaching small parts. Thick CA glue provides even more control and can help fill small gaps around an inlay or repair.
Neither formulation is a replacement for a properly fitted joint, but having a few different viscosities on hand makes CA glue much more useful.
Use CA Glue to Bond Wood, Metal, and Other Materials
One of CA glue's most useful properties is its ability to bond dissimilar materials. The pewter insert in the box shown above is a good example. CA glue can also be useful when working with decorative shell or stone inlays.
I also use it when building shop jigs that combine wood with compatible plastics, such as certain acrylic components. Not every plastic bonds equally well, so test the adhesive on scrap before committing to an important assembly.
If a joint seems slow to cure, a CA glue accelerator may help. For a more controlled result, use a product designed for the adhesive rather than adding excess moisture.
Make Temporary Bonds for Layout and Woodturning
CA glue develops a strong bond quickly, but some temporary setups can be separated by applying a controlled sideways force. This can be useful when you need to hold a small part in position long enough to complete another operation.
For example, a small dab of CA glue can hold hardware in place while you mark or drill its mounting holes. Once the work is complete, you may be able to release the temporary bond with a light tap.
Temporary Workholding at the Lathe
A similar technique can be useful in woodturning. You can temporarily attach a small waste block to a blank, then use that block while preparing a tenon or another workholding feature.
Once the intended operation is complete, the temporary block can be removed. The amount of force required depends on the size and quality of the bond, so test the method before using it on a finished project.
Woodsmith Tip: Don't assume every CA glue joint will release cleanly. For temporary turning setups, use an established workholding method appropriate to the size, weight, and speed of the blank. A temporary adhesive bond should never be relied upon beyond its safe capacity.
Apply a CA Glue Finish to Small Woodturnings
Most woodworking glues aren't suitable as a finish, but CA glue is an exception. On small turned projects, it can create a hard, glossy surface that protects the wood and highlights the grain.
A CA glue finish can be particularly useful on certain oily woods that may be difficult to finish with conventional products. The adhesive forms a film on the surface, which can then be smoothed and polished.
For the best results, follow the finish and application instructions provided by the CA glue manufacturer. Build the finish gradually rather than applying a heavy coat all at once, and allow it to cure before sanding or polishing.
Repair Wood Cracks and Defects with CA Glue and Sanding Dust
Small cracks, chips, and other defects don't necessarily mean a workpiece belongs in the scrap pile. One of my favorite CA glue tricks is combining it with fine sanding dust to make a quick, color-matched repair.
For the closest match, I sand a piece of scrap from the same board or wood species and collect the fine dust. I work the dust into the defect, then add CA glue to bind it together. After the repair cures, I level it with the surrounding surface.
This works well for small cosmetic defects, but it's worth testing the appearance before making a repair in a highly visible area. CA glue can darken sanding dust, and the repaired spot may absorb stain or finish differently from the surrounding wood.
CA Glue Accessories: Debonder and Accelerator
If you plan to use CA glue regularly, there are two companion products worth keeping nearby: a debonder and an accelerator.
Debonder for Cleaning Up CA Glue
A CA glue debonder helps soften or dissolve cured adhesive, making it useful for cleaning up accidental glue spots or separating parts. Acetone can sometimes help, but a dedicated debonder is formulated specifically for this task.
A debonder is also useful to have on hand in case you accidentally bond your fingers. Follow the product directions, and don't force bonded skin apart. If glue gets in your eyes or mouth, seek appropriate medical assistance rather than attempting to use a shop solvent.
Accelerator for Faster Curing
As the name suggests, CA glue accelerator speeds up the curing process. A light application can be useful when you need a repair or small assembly to set quickly.
The tradeoff is that you have very little time to adjust the parts once the adhesive begins to cure. Excess accelerator may also affect the appearance or quality of some bonds, so use it according to the manufacturer's instructions.
When Should You Use CA Glue Instead of Wood Glue?
CA glue earns its place in the shop because it solves problems that ordinary wood glue doesn't handle as conveniently. I reach for it when I need a fast repair, want to secure a small decorative inlay, need to stabilize a narrow crack, or want to apply a hard finish to a small turning.
For larger assemblies that require alignment time, or for conventional structural wood joints, PVA wood glue is generally the more appropriate choice. Keeping both adhesives on hand gives you more options without trying to make one glue do every job.
Once you start experimenting with thin, medium, and thick CA glue, you'll find plenty of uses for it. Add a debonder and accelerator to your supplies, and you'll have a versatile adhesive system ready for all sorts of woodworking challenges.
