After time and use cast Iron chimeneas will develop surface rust, particularity if burnt at high temperatures or left uncovered in the rain. This is usually only surface rust and it will not have any affect, other than aesthetically, on the performance or integrity of your chimenea in the short term.
How do I stop my metal chiminea from rusting?
Make sure you keep it covered over the winter with a waterproof chiminea cover and if you live in an area where the weather can be harsh it would be wise to move it under cover for the winter. Don't fully wrap it in bubble wrap as this just attracts condensation which will hasten any rusting.
Will a steel chiminea rust?
You don?t like rust. Steel rusts if left exposed to the elements. ... Most steel chimeneas and fire bowls require assembly. You want to keep a product for years and years: steel chimeneas and fire bowls are made of fairly thin material and the life span is less than cast iron.