The main problem is the concrete blocks that you are using. They are a real heat sink and are sucking up all the heat from those little bottles. What the maker used in that video was not concrete but what are a soft fire brick, note how easily he shaped them with hand tools, that are the same thing that is used to line pottery kilns with.
Those little torches can be made to work but will quickly leave you with a pile of empty bottles it would be better that you build a regular forge with an aspirated or blown burner. If you google up some forge plans you will get a better idea of what you need.
Doug
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Last edited by Doug Lester; 04-27-2017 at 01:03 PM.
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