Stainless steel balustrading was used on a viewing platform constructed in Plymouth to commemorate the Pilgrim Fathers' departure point. Stainless steel relies for its corrosion resistance on a thin passive oxide surface film. If this surface is damaged during fabrication it will rust rapidly.
To prevent this the answer is to electropolish, a process which removes a surface layer typically 20-40 micrometres thick.
The Plymouth project used a grade of stainless steel (316L) that includes molybdenum for extra corrosion resistance, and the balustrading components were also sent to stainless-steel treatment specialist Anopol for chemical cleaning and electropolishing.