Epoxy adhesive is strong and has good gap-filling properties if structural fillers have been mixed into it. It gives greatest bond strength if there is not wood to wood contact, ie the epoxy must not all be squeezed out of the joint by clamping pressure. For laminating work in producing formed beams etc, it needs to be clamped to a former until fully cured. If not, the member will straighten out due to creep of the resin and be impossible to return to the intended shape. This means that any excess glue which is not cleaned off will be hard when the piece is unclamped and can be a chore to remove if access is a problem.
Resorcinol is also strong and has moderate gap-filling properties.
This two-component adhesive comprises a liquid resin and either a resin or a powder as the hardener. Accurate measurement for mixing is easier with the liquid type than with the powder type. This is the only adhesive which can be used in the manufacture of maring grade plywood, because of its superior adhesion to wet timber. Glue joints are strongest with wood to wood contact, ie high clamping pressures to squeeze the excess out of the joint. It does not creep once the initial set has taken place, at which stage it has a consistency like very hard rubber.