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If you do stained glass, the flux DOES matter. I bought a less expensive paste, horrible results. Then used liquid my husband had, again horrible results. Thought my iron was going out. Just used this and it works great. Will only use this in the future, too much time and cost into my pieces to ruin them with anything less!
There's nothing really to say about Novacan Oil Master's Flux other than its the BEST on the market. Anyone who does stained glass knows this and utilizes this product or its sister product for leading work. I purchased this on Amazon for the value and will repurchase it in a few years when my bottle runs low. A little goes a long long way, even with big windows, so this is absolutely everything I need.