I am new to the forum and my first knife project is repurposing an old (50 to 75 years old) JA Henkels knife that I bought at a garage sale. The knife was so rusty that there were no visible markings and I only saw those when I started grinding it down. I am almost finished with the knife and am having difficulty doing the final polish. I didn't anneal the blade before grinding it and was careful not to overheat it while grinding. The steel seems very hard and sandpaper kind of skids across the surface rather than cutting and when I use stones they make the surface frosty. I am wondering if this is difficult steel to work with or if I need to try something different. I am new at this and it could easily be me. Any advice would be appreciated. Thanks