Should I have any concerns with operators using flux for handsoldering, straight out of a 25 ltr drum which is not even thinned dowm to the correct SG level. The flux is Alpha 615-25 RMA based and we use it in our wavesoldering process.
my experience tells me you should have no problem. However please remove the flux residues from the board. Unless of course this is a product that is inexpensive and you don't care about degradation/flux migration etc. In example an electronic toy. There are many fine flux removing aerosols on the market place take a look at Microcare.com.