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I wasn't able to find this information before, but apparently MAPP Pro(i.e. fake MAPP gas) has a flame around 3,600 F, which is only 150 degrees hotter than propane. I guess if I had to choose one, I'd still go for MAPP Pro and maybe that extra 150 degrees may help with some metals. http://www.garagejournal.com/forum/archive/index.p...Thanks for your reply! And yeah, I totally get you about "upgrades". I avoid them whenever I can.
Have you used MAPP gas recently? I was actually just thinking of building a tiny foundry using similar methods to this instructable and thought about using MAPP gas, but read that the original mixture is no longer sold for some reason and it's instead a substitute. I would like to know if the new stuff still burns hotter than propane, even though it would only be a few bucks wasted just to see.
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