I am doing the build up on an msd 2500 right now. And let me tell you, it is a lot of work. These things need the steel to be built back up around the blades cause they wear down from the material they shear. 2 weeks, 75 hours, 3- 40 pound spools of wire for the welder and have still not begun the hard surfacing. Can't wait to see this thing destroy once again.