Epoxies are well known as excellent bonding agent. But they can also be used as a clamp and a dent filler. A 2 minute epoxy is a great way to hold odd pieces together that are hard to clamp. Use it in tiny amounts with your primary adhesive in other spots as the quick drying epoxies typically do not have time to penetrate into wood fibers to make a strong bond.
If you are finishing or re-finishing something and you have a dent (or a gouge that does not destroy the grain), you can fill it in with a clear epoxy after your first seal coat to level it off. Sand with 220 grit and topcoat.