We switched out our Acetylene for Propylene. Propylene is cheaper then Acetylene per bottle right now, but you also only use 1 bottle of Propylene to 4 or 5 bottles of Acetylene. We've cut up to 2 1/2" plate with the Propylene and its amazing, it leave a little bit of slag like a plasma would do on 1/2". We use to cut the thicker plates with Acetylene, it would do the job but is way slower and not as clean as a cut. And with the rosebud we have for the Propylene you can heat through 3" plate to red hot on the opposite side in about a minute. We just got different tips on our Victor torch and its working great. They say the Propylene will eventually eat up the Acetylene hose, but we'll worry about that later.