Using this antique Union double - burner kerosene cookstove is a great way to experience old - fashioned cooking. First, make sure to replace the missing wicks. Fill the fuel tank with kerosene carefully, and light the burners. You can use it for small - scale cooking tasks outdoors or in a well - ventilated area. When using, always keep it on a flat and stable surface. After each use, let the cookstove cool down completely before storing it. For maintenance, clean the burners regularly to prevent clogging. Check the fuel tank for any leaks or damage. You can also repaint it if you want to restore its appearance, but be careful not to cover any important markings.