Inject Epoxy into Loose Joints
When one or two joints loosen on a chair but you can't get the rest of them apart, here's an advanced repair technique to try: Inject epoxy into the loose joints using a syringe.
Once mixed, most epoxy is too thick to push through a syringe. However, an epoxy used for fiberglass boat repair (like the one shown here) has just the right consistency. To inject the glue, drill 1/8-in. holes in an inconspicuous place in line with the dowels. Aim for the cavity behind each dowel. Insert the syringe into the hole, then inject the epoxy until it runs out of the joint. Push the joint together, then wipe off the excess epoxy.
Epoxy is available in convenient packets—you just tear off the top and squeeze. They’re available online (one source is westmarine.com), but this epoxy is more expensive than the hardware store variety. Plastic syringes are available at many pharmacies and online.