I'm using this one for the first time. I welded on a broken steel trench tool. First I sanded it at an angle and you can see the result. I was happy with this result. I have to adjust the settings but it's not that bad and seems stronger than the original. I welded both sides. The second time I used them I tried to build up some metal for a worn tool. The slag was too big and too fast so I had to stop to clean it before I could do a second pass and it didn't come off easily. I then switched to my welder to finish the project.