Solution in search of a problem
While this kind of substance might be very attractive for deep sea diving,* I don't see any real reason for using anything other than normal earth-type atmosphere and pressure in space. As soon as someone gets off their duff and finishes developing Ames high-pressure hardsuits, the last real obstacle to a normal atmosphere in space will be pretty much gone.
*People have been looking at this fluid for diving for many years (it showed up in the movie "Abyss"), but I have yet to see it used other than experimentally. Must be some problem with it.