The wave solder will deactivate the acids in this liquid wave-solder flux (and in my last message I meant to say deactivate the flux, not deactivate the solder!), so unless the flux gets sprayed in a place where it won't see a decent amount of heat, there's no issue with this flux.  Yes, it can leave a mess, but usually it's a thin layer of flux residue that is hard and not tacky, and has a high SIR.  When used in the right process!  I also like the clean look of watersoluble fluxed boards, but there are times when these will get trapped under low/no clearance parts and cause leakage paths.  Also, there are certain parts that can't tolerate exposure to halide-containing acid fluxes, so those need a different flux selection.  Another way-back experience was with RMA flux residues during a harsh condensing test -- it acted like a conformal coating, preventing the metal from shorting under condensation.  Wouldn't be a guarantee, but it decreased the shorting, didn't increase it.