This presentation discusses the optimization of PEP, both as a stand-alone process and in combination with particle blasting, to improve the surface quality of additively manufactured stainless steel samples. In addition, the feasibility of applying PEP to multi-material structures, specifically Functional Graded Materials (FGMs) produced by Directed Energy Deposition (DED), focusing on materials comprising a cast iron base, an Inconel intermediate layer and a top layer of maraging steel, is explained.