Normally, this adhesive is a urea formaldehyde powder that must be mixed with water. Two part resins are more difficult to use because you must mix only the amount you'll use in a reasonable length of time. There are some drawbacks to using plastic resins, including the urea gas given off while the glue is curing. And, oily woods, such as teak don't bond well with plastic resin. When a high strength, highly waterproof bond is needed, epoxy resin is the adhesive of choice.
Most manufacturers sell a two part system consisting of a resin and hardener.
However, epoxy resin can be very frustrating to use. For all it's positive aspects, including high shear strength and almost complete waterproof properties, it has some negative aspects that must be considered. Epoxy cures fast and if there is glue squeezed out during the joint fitting, it has to be removed immediately or it's there for good. Don't get any on your shop equipment because it won't come off easily, including wood clamps that are temporarily holding the joint. And, the price is high.