On 2 Feb, 02:28, sam wrote:

I cannot seem to get glue
to hold this chair together for more than a few days.

That's usual for chairs - they see a hard life with lots of racking
stresses on the leg joints.

There are three good approaches:

1. Veritas' "Chair Doctor" glue. This is a watery glue that swells
the existing tenons.
When it works, it works well. However a chair that has been broken for
long will have worn and rounded tenons and you need something that's
gap filling too.

2. Epoxy with a filler. Use good epoxy (West System) and an
appropriate fibre filler, mixed to the consistency of mayonnaise. If
it's really bad, use the epoxy on the tenon first (and stiffened to
peanut butter texture) to get the tenon back to shape, let that cure
and then shape it to fit, before re-gluing with slightly thinner epoxy
(maybe microballoon filler rather than fibres).

3. Antiques use hide glue, nothing else. Sometimes some complicated
joinery too.

Cleaning off old glue first is important if it's thick, or if you're
gap filling.

Don't use foxed wedges in tenons.