There are a few things you can do to prevent your chiminea from rusting. First, make sure that you regularly clean and dry your chiminea after use. This will help to remove any moisture or debris that could potentially cause rust. Secondly, consider applying a high quality sealant or paint to your chiminea. This will create an additional layer of protection against the elements. Finally, store your chiminea in a dry, sheltered area when not in use. By taking these simple precautions, you can help to ensure that your chiminea remains in good condition for many years to come.