Should I be fluxing while I am casting using my lee production pot? I flux generously while smelting my ww into ingots but have been noticing some gray dust in the pot that accumulates during casting. I am guessing that its tin coming out of the alloy right? I haven't been fluxing during the casting because I was concerned of the risk of a flame up in the electric pot from the wax getting too hot and catching fire. Advice and technique tips appreciated.
Mike.