Not necessarily, it removes copper which is what it's meant to do and that's a good thing it's just how it removes copper that "could" lead to the need for a smoothing round. The bore polish is recommended to smooth out this 'etching' which is just another process. Before I started using wipeout I used KG products but had too much inconsistency, but as they say YMMV. Wipeout is a one stop product, removing powder fouling, carbon and copper without changing the point of impact significantly enough to worry about.