Yep, a waterstone to re sharpen the blade or a pasted paddle strop or bench strop that does the same. This isn't really honing but just taking a sharp blade back to a finishing step for a 'refresh' to get it shaving well again. Most guys use the same thing for this that they would to put a fine finish on a blade they were honing up. eventually this even might not be enough and the blade will need to be rehoned with coarser stones but here we are talking a while.