Surcon SS 375 and Surfix SS Black Description Application: A blackening process for stainless steel. The Growel Advantage: The Surfix SS Black is used in combination with Surcon 375 for blackening of different grades of stainless steel like 202, 304 etc. Additionally, it provides a uniform black finish. Applying a good quality rust preventive oil on blackened substrates enhances appearance and corrosion resistance. get a quote