I use food grade mineral oil as Norton stones recommends this and most all card carring meat cutters us it. Yes,CJ it helps w/ the build up and resistance.What ever you use, once started keep using that product.For using oil will build up deep in the pores of the stone. Then if water is used it doesn't seep in it just sits on top.So, often cleaning is important. With hand cleaner and brush followed by alcohol does a good job for me keeping my stones well tuned.DM