I agree, water on the surface is not a problem. Water or moisture below the surface is a big deal. Thats one of the reasons that I quit using commercial flux's like Marvleflux (Spelling ?). It leaves a crust on spoons and other tools that absorbs moisture. Before I put any tool such as a ladle, spoon, skimmer, ect into molten lead I'll float it on top for a few minutes to evaporate any moisture.