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Regarding this, can you spray paint a rusty fire pit?
Spray Paint Project Steps If there are areas with flaking rust, use a wire brush to remove it. Thoroughly clean the fire pit with an all-purpose cleaner/degreaser. Rinse with water and allow to dry. NOTE: Do not apply paint to the inside of the fire pit where surface is exposed to open flame.
Beside this, is it safe to burn rust?
A grill with loose rust is not safe, as rust may stick to the food; a grate with minor surface rust can be cleaned and treated to continue using it. While ingesting rust may not likely cause harm from one meal, continuous ingestion may be problematic for the intestinal tract.
So, some wood burning fire pit manufacturers recommend putting a layer of sand in the bottom of your metal fire pit. The reason is simple; A layer of sand in your wood burning fire pit bowl is supposed to protect the metal from extreme heat.