Use when time is not an issue & there are no gaps to fill because it shrinks as it dries. (So the break or joint should be tight fitting without gaps or chips of wood missing.)
This type of glue dries by evaporation, which means it is slow to dry.
You will need clamps to hold the item while it is drying.
Yellow glue will absorb into the wood fibers forming a strong bond that will not easily be broken..
Epoxy Glue
Epoxy glues have 2 parts that you mix together. 1 part is resin, 1 part is a hardening agent.
Use when there are gaps to fill & you don't need the quicker set-up time of the zap glues.
It is also good for bonding different materials together, like wood & metal.
It is non-shrinking.
Epoxy glues grab the wood on the surface, rather than penetrating, like the yellow glues.
Zap Glue
These are Cyanoacrylate Adhesives. Use when time is an issue.
The brand we use at our shop and sell is Zap. It is available in 3 consistencies. You make your choice by how much filling you need. The super thick is good if you have a large gap to fill. The thick, minor gaps. You may have a situation where taking a joint apart is not an option or not necessary. In this case, the "Thin" works well because it can be wicked into the joint.