Why does my fire extinguisher look rusty or scratched?

Light surface marks can happen with stored metal equipment, but rust, dents or deep scratches on a pressurised extinguisher need careful attention. Do not use a damaged extinguisher in an emergency until it has been checked, because the manuals warn against dropping, crushing or altering the cylinder. fileciteturn0file4turn0file11

1. Wipe the outside casing with a dry cloth first. If the mark is only dust or grime, it should come away easily. If the stain remains, inspect it again in good light.
2. Check whether the damage is only cosmetic. Small paint scuffs are different from corrosion, a dented shell, or a bent valve area. Any structural damage is a reason to stop using the unit.
3. Look closely at the base, bracket area and label edges. These are common places for moisture to collect. The extinguisher should be stored away from heat sources and protected from rough handling. fileciteturn0file4turn0file11
4. Make sure no information label has been removed or altered. The manuals state that stamped numbers and labels are important for maintenance and refilling. fileciteturn0file4turn0file11
5. Do not sand, paint over or seal the damaged area. Do not drill, weld or otherwise modify the cylinder. Those actions are not permitted and may make the extinguisher unsafe. fileciteturn0file4turn0file11

Stop using the extinguisher immediately if the rust is spreading, metal is flaking, the cylinder is dented, or you see any sign of leakage. If the condition is uncertain, contact the retailer or store where the product was purchased.