[/QUOTE] Im using Buck Beaver Flux.
It cost few$$ but seams to do a great job.
Let it "Sizzle" and when its done just mix in.
There is no smoke like you get from saw dust and other "burning" material.
http://www.ebay.com/itm/Buck-Beaver-...item4d09f17cec
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This stuff looks to be very similar to,,,--- the same as marvelux or that frankford arsenal ap-cray. A boron type of flux. It'll clean your melt real well, but remove the valuable tin oxide, depleting your tin from the alloy. Then it leaves behind a glass-like deposit that adsorbs humidity from the air.