Mirror Finish on Stainless Steel. Achieve a mirror finish on stainless steel using the PTX Eco Smart 47002 and the PTX Expansion Roller 47005. Pregrinding: If thick welds need to be blended in we recommend using the Plantex Ceramic Flap Disc 93551 (4 ½ X 60 grit) and the Varilex tool 65000A.