304 stainless steel has superior corrosion resistance due to ingredients chromium (18%) and nickel (8%). This material can still stain, so it is important to protect it during installation, and then to maintain it with appropriate cleaners. It is not recommended to paint stainless steel.
The #4 finish is a brushed finish that tends to hide minor scratching and surface imperfections – so it remains attractive even in high traffic areas. Alternate finishes may be requested depending on the application. Please discuss with your sales contact.