Cured epoxy resins have a number of different properties. They are a very stable and durable material, suitable to build machines and structures with a long lifespan. Epoxies have also good mechanical properties, making them a hard material but flexible at the same time. Epoxies are also adhesives materials which can be used in many ways. Finally, both resins and hardeners can be stored for a long time if they are not mixed, which is why epoxies are also specified in do-it-yourself packages for experienced, safety-aware users.