A mildly activated, water soluble flux for use prior to hot oil pot fusing. ACTI-FLOis formulated to be compatible with THERMO FLO? and PRO FUSE. It contains ingredients used in the fusing fluids, which results in reduced consumption and extended fluid life as the flux is dragged in. It provides consistent surface smoothness, even for hard-to-fuse areas and is non-foaming.