I have used natural gas, acetylene, gasoline, propane and jet fuel for cutting. The best results for each gas depends on skill and technique. For general scrapping projects propane is the only cost effective option in my opinion. If the project requires cutting aluminum, cast iron or iron with a diameter of one foot or more, I would select gasoline or jet fuel. With scrap art, acetylene is my gas of choice. I have given up on natural gas because I have not found a use that the other gasses could not meet, much less out perform. Just my opinion and personal perspective.
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