No, rust is a natural occurrence, even on stainless steel, which is resistant to corrosion due to its native protective layer (chromium oxide). Our numbers may require a small amount of maintenance to keep your numbers from rusting, such as cleaning and applying protective barriers. This is more of a concern for coastal zones with high humidity and salinity. Customers living in these environments should take extra precautions to ensure the longevity of the stainless steel and keep it looking good.
A quick google search will turn up many products that will help protect your numbers.